diff --git a/Changelog b/Changelog
new file mode 100755
index 0000000..25ff61a
--- /dev/null
+++ b/Changelog
@@ -0,0 +1,31 @@
+ex-20070109
+
+API changes
+
+* os.unsetenv is now folded into os.setenv
+
+* os.rmdir is now folded into os.remove
+
+* os.dir now elides . and .. entries from the listing
+
+* lock and unlock now appear in the io table
+
+* io.lock and io.unlock return the file object in case of success
+
+POSIX implementation changes
+
+* ENVIRON_DECL should be defined to expand to extern char **environ; on systems which neglect to declare environ when including <unistd.h>
+
+* prepare for dirent metatable
+
+* ex_pipe() refactored
+
+Windows implementation changes
+
+* os.remove must be overridden
+
+* prepare for dirent metatable
+
+* simplify directory iteration by adding POSIX-like abstraction
+
+* ex_pipe() refactored
diff --git a/README b/README
index a60a4da..0d7661a 100755
--- a/README
+++ b/README
@@ -1,10 +1,10 @@
 -- Environment
-os.setenv(name, value)
-os.unsetenv(name)
+os.getenv(name) -- get environment variable
+os.setenv(name, value) -- set/unset environment variable
 os.environ() -- returns a copy of the environment
 
 -- Miscellaneous
-os.sleep(seconds)
+os.sleep(seconds) -- sleep for (floating) seconds
 
 -- File system
 os.chdir(pathname)
diff --git a/posix/Makefile b/posix/Makefile
index 19c984e..1d5dfd9 100755
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -1,13 +1,13 @@
 CFLAGS = $(WARNINGS) $(DEFINES) $(INCLUDES)
-DEFINES = $(DEBUG) -D_XOPEN_SOURCE=600 -DMISSING_POSIX_SPAWN -DMISSING_ENVIRON_DECL="extern char **environ"
+DEFINES = $(DEBUG) -D_XOPEN_SOURCE=600 -DMISSING_POSIX_SPAWN -DENVIRON_DECL="extern char **environ;"
 DEBUG= -D'debug(...)=fprintf(stderr,__VA_ARGS__)'
 # -D_POSIX_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112L \
 	-U__STRICT_ANSI__ -D_GNU_SOURCE
 INCLUDES = -I$(LUA)/include -I$(LUA)/src
 WARNINGS = -W -Wall
 #LUA = /home/mark/src/lang/lua/lua-5.1-rc2
-#LUA = /home/mark/src/lang/lua/lua51
 LUA = /home/medgar/src/lang/lua/lua-5.1.1
+#LUA = /home/medgar/src/lang/lua/lua5_1_1/cygw15
 LIBS = -L$(LUA)/src -llua5.1
 
 ex-OBJS = ex.o spawn.o
diff --git a/posix/ex.c b/posix/ex.c
index 8521785..78b79ec 100755
--- a/posix/ex.c
+++ b/posix/ex.c
@@ -3,23 +3,21 @@
 #include <ctype.h>
 #include <errno.h>
 #include <string.h>
-#include <unistd.h> /* environ */
-
-#include "lua.h"
-#include "lualib.h"
-#include "lauxlib.h"
 
 #include <unistd.h>
+ENVIRON_DECL
 #include <dirent.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 
-#include "spawn.h"
+#include "lua.h"
+#include "lualib.h"
+#include "lauxlib.h"
 
-MISSING_ENVIRON_DECL;
+#define absindex(L,i) ((i)>0?(i):lua_gettop(L)+(i)+1)
 
+#include "spawn.h"
 
-#define absindex(L,i) ((i)>0?(i):lua_gettop(L)+(i)+1)
 
 /* -- nil error */
 extern int push_error(lua_State *L)
@@ -41,8 +39,8 @@ static int ex_getenv(lua_State *L)
 	return 1;
 }
 
-/* name value -- true/nil error *
- * name -- true/nil error */
+/* name value -- true/nil error
+ * name nil -- true/nil error */
 static int ex_setenv(lua_State *L)
 {
 	const char *nam = luaL_checkstring(L, 1);
@@ -126,13 +124,23 @@ static FILE *check_file(lua_State *L, int idx, const char *argname)
 	return *pf;
 }
 
+static FILE **new_file(lua_State *L, int fd, const char *mode)
+{
+	FILE **pf = lua_newuserdata(L, sizeof *pf);
+	*pf = 0;
+	luaL_getmetatable(L, LUA_FILEHANDLE);
+	lua_setmetatable(L, -2);
+	*pf = fdopen(fd, mode);
+	return pf;
+}
+
+
 #define new_dirent(L) lua_newtable(L)
 
-/* pathname/file -- entry */
+/* pathname/file [entry] -- entry */
 static int ex_dirent(lua_State *L)
 {
 	struct stat st;
-	int isdir;
 	switch (lua_type(L, 1)) {
 	default: return luaL_typerror(L, 1, "file or pathname");
 	case LUA_TSTRING: {
@@ -146,19 +154,20 @@ static int ex_dirent(lua_State *L)
 			return push_error(L);
 		} break;
 	}
-	isdir = S_ISDIR(st.st_mode);
 	if (lua_type(L, 2) != LUA_TTABLE) {
+		lua_settop(L, 1);
 		new_dirent(L);
-		lua_replace(L, 2);
 	}
-	if (isdir)
+	else {
+		lua_settop(L, 2);
+	}
+	if (S_ISDIR(st.st_mode))
 		lua_pushliteral(L, "directory");
 	else
 		lua_pushliteral(L, "file");
 	lua_setfield(L, 2, "type");
 	lua_pushnumber(L, st.st_size);
 	lua_setfield(L, 2, "size");
-	lua_settop(L, 2);
 	return 1;
 }
 
@@ -202,8 +211,8 @@ static int diriter_close(lua_State *L)
 
 static int isdotfile(const char *name)
 {
-	return name[0] && (name[1] == 0
-		|| (name[1] == '.' && name[2] == 0));
+	return name[0] == '.' && (name[1] == '\0'
+		|| (name[1] == '.' && name[2] == '\0'));
 }
 
 /* pathname -- iter state nil */
@@ -259,11 +268,11 @@ static int file_lock(lua_State *L, FILE *f, const char *mode, long offset, long
 	k.l_len = length;
 	if (-1 == fcntl(fileno(f), F_SETLK, &k))
 		return push_error(L);
-	lua_pushboolean(L, 1);
+	lua_settop(L, 1);
 	return 1;
 }
 
-/* file mode [offset [length]] -- true/nil error */
+/* file mode [offset [length]] -- file/nil error */
 static int ex_lock(lua_State *L)
 {
 	FILE *f = check_file(L, 1, NULL);
@@ -273,7 +282,7 @@ static int ex_lock(lua_State *L)
 	return file_lock(L, f, mode, offset, length);
 }
 
-/* file [offset [length]] -- true/nil error */
+/* file [offset [length]] -- file/nil error */
 static int ex_unlock(lua_State *L)
 {
 	lua_pushliteral(L, "u");
@@ -290,22 +299,12 @@ static int closeonexec(int d)
 	return fl;
 }
 
-static int new_file(lua_State *L, int fd, const char *mode)
-{
-	FILE **pf = lua_newuserdata(L, sizeof *pf);
-	*pf = 0;
-	luaL_getmetatable(L, LUA_FILEHANDLE);
-	lua_setmetatable(L, -2);
-	*pf = fdopen(fd, mode);
-	return 1;
-}
-
 /* -- in out/nil error */
 static int ex_pipe(lua_State *L)
 {
 	int fd[2];
 	if (-1 == pipe(fd))
-		return 0;
+		return push_error(L);
 	closeonexec(fd[0]);
 	closeonexec(fd[1]);
 	new_file(L, fd[0], "r");
@@ -322,8 +321,8 @@ static void get_redirect(lua_State *L, int idx, const char *stdname, struct spaw
 	lua_pop(L, 1);
 }
 
-/* filename [args-opts] -- true/nil error */
-/* args-opts -- true/nil error */
+/* filename [args-opts] -- proc/nil error */
+/* args-opts -- proc/nil error */
 static int ex_spawn(lua_State *L)
 {
 	struct spawn_params *params;
@@ -385,13 +384,13 @@ static int ex_spawn(lua_State *L)
 		}
 		lua_getfield(L, 2, "env");              /* cmd opts ... envtab */
 		switch (lua_type(L, -1)) {
+		default: return luaL_error(L, "bad env option (table expected, got %s)",
+			luaL_typename(L, -1));
 		case LUA_TNIL:
 			break;
 		case LUA_TTABLE:
 			spawn_param_env(params);            /* cmd opts ... */
 			break;
-		default:
-			return luaL_error(L, "bad env option (table expected, got %s)", luaL_typename(L, -1));
 		}
 		get_redirect(L, 2, "stdin", params);    /* cmd opts ... */
 		get_redirect(L, 2, "stdout", params);   /* cmd opts ... */
@@ -405,9 +404,7 @@ static int ex_spawn(lua_State *L)
 /* copy the fields given in 'l' from one table to another; insert missing fields */
 static void copy_fields(lua_State *L, const luaL_reg *l, int from, int to)
 {
-	from = absindex(L, from);
-	to = absindex(L, to);
-	for (; l->name; l++) {
+	for (to = absindex(L, to); l->name; l++) {
 		lua_getfield(L, from, l->name);
 		if (lua_isnil(L, -1)) {
 			lua_pop(L, 1);
@@ -467,6 +464,7 @@ int luaopen_ex(lua_State *L)
 	lua_getglobal(L, "io");                     /* ex . io */
 	if (lua_isnil(L, -1)) return luaL_error(L, "io not loaded");
 	copy_fields(L, ex_iolib, 1, -1);            /* ex . io */
+	copy_fields(L, ex_iofile_methods, 1, -1);   /* ex . io */
 	lua_getfield(L, 1, "pipe");                 /* ex . io ex_pipe */
 	lua_getfield(L, -2, "stderr");              /* ex . io ex_pipe io_stderr */
 	lua_getfenv(L, -1);                         /* ex . io ex_pipe io_stderr E */
diff --git a/posix/posix_spawn.c b/posix/posix_spawn.c
index 7514df4..a1499b0 100755
--- a/posix/posix_spawn.c
+++ b/posix/posix_spawn.c
@@ -3,6 +3,7 @@
 #include <errno.h>
 
 #include <unistd.h>
+ENVIRON_DECL
 #include <limits.h>
 #include <sys/types.h>
 
@@ -12,7 +13,6 @@
 #define OPEN_MAX sysconf(_SC_OPEN_MAX)
 #endif
 
-MISSING_ENVIRON_DECL;
 
 int posix_spawn_file_actions_init(posix_spawn_file_actions_t *act)
 {
diff --git a/posix/spawn.c b/posix/spawn.c
index fd30bdf..b39d53b 100755
--- a/posix/spawn.c
+++ b/posix/spawn.c
@@ -1,7 +1,5 @@
-#include "lua.h"
-#include "lauxlib.h"
-
 #include <unistd.h>
+ENVIRON_DECL
 #include <sys/wait.h>
 #if MISSING_POSIX_SPAWN
 #include "posix_spawn.h"
@@ -9,8 +7,10 @@
 #include <spawn.h>
 #endif
 
+#include "lua.h"
+#include "lauxlib.h"
+
 #include "spawn.h"
-MISSING_ENVIRON_DECL;
 
 struct spawn_params {
 	lua_State *L;
diff --git a/posix/spawn.h b/posix/spawn.h
index 46d9753..bb5df7c 100755
--- a/posix/spawn.h
+++ b/posix/spawn.h
@@ -2,7 +2,7 @@
 #define SPAWN_H
 
 #include <stdio.h>
-#include <lua.h>
+#include "lua.h"
 
 #define PROCESS_HANDLE "process"
 struct process;
diff --git a/w32api/Makefile b/w32api/Makefile
index 3586c30..a752624 100755
--- a/w32api/Makefile
+++ b/w32api/Makefile
@@ -8,8 +8,10 @@ WARNINGS = -W -Wall -Wno-missing-braces
 LUA = /home/medgar/work/noom/lua/lua51
 LUALIBS = -L$(LUA) -llua5.1
 
-ex.dll-OBJS = ex.o spawn.o pusherror.o
+ex.dll-OBJS = ex.o spawn.o pusherror.o dirent.o
 ex.dll-LIBS = $(LUALIBS) $(EXTRALIBS)
 ex.dll: $(ex.dll-OBJS)
 	$(CC) $(TARGET_ARCH) -shared -o $@ $(ex.dll-OBJS) $(ex.dll-LIBS)
 clean:; rm ex.dll *.o
+
+wdir.o: wdir.c wdir.h
diff --git a/w32api/dirent.c b/w32api/dirent.c
new file mode 100755
index 0000000..cbce017
--- /dev/null
+++ b/w32api/dirent.c
@@ -0,0 +1,68 @@
+#include <windows.h>
+#include <stdlib.h>
+#include "dirent.h"
+
+struct DIR_tag {
+	int first;
+	HANDLE hf;
+	WIN32_FIND_DATA fd;
+};
+
+static char *mkpattern(const char *name)
+{
+	static const char suffix[] = "\\*";
+	size_t len = strlen(name);
+	char *pattern = malloc(len + sizeof suffix);
+	if (pattern)
+		strcpy(memcpy(pattern, name, len) + len, suffix);
+	return pattern;
+}
+
+DIR *
+opendir(const char *name)
+{
+	DIR *pi = malloc(sizeof *pi);
+	char *pattern = mkpattern(name);
+	if (!pi || !pattern
+	    || INVALID_HANDLE_VALUE == (pi->hf = FindFirstFile(pattern, &pi->fd))) {
+		free(pi);
+		pi = 0;
+	}
+	else {
+		pi->first = 1;
+	}
+	free(pattern);
+	return pi;
+}
+
+static int isdotfile(const char *name)
+{
+	return name[0] == '.' && (name[1] == 0
+		|| (name[1] == '.' && name[2] == 0));
+}
+
+const WIN32_FIND_DATA *
+readdir(DIR *pi)
+{
+	switch (pi->first) do {
+	default:
+		if (!FindNextFile(pi->hf, &pi->fd)) {
+			FindClose(pi->hf);
+			pi->hf = INVALID_HANDLE_VALUE;
+			return 0;
+		}
+	case 1: pi->first = 0;
+	} while (isdotfile(pi->fd.cFileName));
+	return &pi->fd;
+}
+
+void
+closedir(DIR *pi)
+{
+	if (pi->hf != INVALID_HANDLE_VALUE)
+	{
+	    FindClose(pi->hf);
+	    pi->hf = INVALID_HANDLE_VALUE;
+	}
+	free(pi);
+}
diff --git a/w32api/dirent.h b/w32api/dirent.h
new file mode 100755
index 0000000..b88825a
--- /dev/null
+++ b/w32api/dirent.h
@@ -0,0 +1,6 @@
+#include <windows.h>
+
+typedef struct DIR_tag DIR;
+DIR *opendir(const char *name);
+const WIN32_FIND_DATA *readdir(DIR *pi);
+void closedir(DIR *pi);
diff --git a/w32api/ex.c b/w32api/ex.c
index 4466c44..5e22fdf 100755
--- a/w32api/ex.c
+++ b/w32api/ex.c
@@ -7,18 +7,19 @@
 #include <io.h>
 #include <fcntl.h>
 #include <sys/locking.h>
+#include "dirent.h"
 
 #include "lua.h"
 #include "lualib.h"
 #include "lauxlib.h"
 
-#include "spawn.h"
-#include "pusherror.h"
+#define absindex(L,i) ((i)>0?(i):lua_gettop(L)+(i)+1)
 
+#include "spawn.h"
 
-#define absindex(L,i) ((i)>0?(i):lua_gettop(L)+(i)+1)
+#include "pusherror.h"
+#define push_error(L) windows_pushlasterror(L)
 
-#define file_handle(fp) (HANDLE)_get_osfhandle(fileno(fp))
 
 
 /* name -- value/nil */
@@ -32,7 +33,7 @@ static int ex_getenv(lua_State *L)
 		len = GetEnvironmentVariable(nam, val, sizeof val);
 	}
 	if (len == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND)
-		return windows_pushlasterror(L);
+		return push_error(L);
 	lua_pushlstring(L, val, len);
 	if (val != sval) free(val);
 	return 1;
@@ -45,7 +46,7 @@ static int ex_setenv(lua_State *L)
 	const char *nam = luaL_checkstring(L, 1);
 	const char *val = lua_tostring(L, 2);
 	if (!SetEnvironmentVariable(nam, val))
-		return windows_pushlasterror(L);
+		return push_error(L);
 	lua_pushboolean(L, 1);
 	return 1;
 }
@@ -55,7 +56,7 @@ static int ex_environ(lua_State *L)
 {
 	const char *nam, *val, *end;
 	const char *envs = GetEnvironmentStrings();
-	if (!envs) return windows_pushlasterror(L);
+	if (!envs) return push_error(L);
 	lua_newtable(L);
 	for (nam = envs; *nam; nam = end + 1) {
 		end = strchr(val = strchr(nam, '=') + 1, '\0');
@@ -81,7 +82,7 @@ static int ex_chdir(lua_State *L)
 {
 	const char *pathname = luaL_checkstring(L, 1);
 	if (!SetCurrentDirectory(pathname))
-		return windows_pushlasterror(L);
+		return push_error(L);
 	lua_pushboolean(L, 1);
 	return 1;
 }
@@ -91,7 +92,7 @@ static int ex_mkdir(lua_State *L)
 {
 	const char *pathname = luaL_checkstring(L, 1);
 	if (!CreateDirectory(pathname, 0))
-		return windows_pushlasterror(L);
+		return push_error(L);
 	lua_pushboolean(L, 1);
 	return 1;
 }
@@ -101,7 +102,7 @@ static int ex_currentdir(lua_State *L)
 {
 	char pathname[MAX_PATH + 1];
 	size_t len = GetCurrentDirectory(sizeof pathname, pathname);
-	if (len == 0) return windows_pushlasterror(L);
+	if (len == 0) return push_error(L);
 	lua_pushlstring(L, pathname, len);
 	return 1;
 }
@@ -115,12 +116,13 @@ static int ex_remove(lua_State *L)
 	    || (attr & FILE_ATTRIBUTE_DIRECTORY
 	        ? !RemoveDirectory(pathname)
 	        : !DeleteFile(pathname)))
-		return windows_pushlasterror(L);
+		return push_error(L);
 	lua_pushboolean(L, 1);
 	return 1;
 }
 
-FILE *check_file(lua_State *L, int idx, const char *argname)
+
+static FILE *check_file(lua_State *L, int idx, const char *argname)
 {
 	FILE **pf;
 	if (idx > 0) pf = luaL_checkudata(L, idx, LUA_FILEHANDLE);
@@ -137,6 +139,19 @@ FILE *check_file(lua_State *L, int idx, const char *argname)
 	return *pf;
 }
 
+static FILE **new_file(lua_State *L, HANDLE h, int dmode, const char *mode)
+{
+	FILE **pf = lua_newuserdata(L, sizeof *pf);
+	*pf = 0;
+	luaL_getmetatable(L, LUA_FILEHANDLE);
+	lua_setmetatable(L, -2);
+	*pf = _fdopen(_open_osfhandle((long)h, dmode), mode);
+	return pf;
+}
+
+#define file_handle(fp) (HANDLE)_get_osfhandle(fileno(fp))
+
+
 static uint64_t get_file_size(const char *name)
 {
 	HANDLE h = CreateFile(name, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
@@ -169,7 +184,7 @@ static int ex_dirent(lua_State *L)
 		const char *name = lua_tostring(L, 1);
 		attr = GetFileAttributes(name);
 		if (attr == (DWORD)-1)
-			return windows_pushlasterror(L);
+			return push_error(L);
 		isdir = attr & FILE_ATTRIBUTE_DIRECTORY;
 		if (isdir)
 			size = 0;
@@ -181,7 +196,7 @@ static int ex_dirent(lua_State *L)
 		uint64_t lsize;
 		BY_HANDLE_FILE_INFORMATION info;
 		if (!GetFileInformationByHandle(file_handle(f), &info))
-			return windows_pushlasterror(L);
+			return push_error(L);
 		attr = info.dwFileAttributes;
 		isdir = attr & FILE_ATTRIBUTE_DIRECTORY;
 		lsize = info.nFileSizeHigh; lsize <<= 32; lsize += info.nFileSizeLow;
@@ -205,12 +220,7 @@ static int ex_dirent(lua_State *L)
 	return 1;
 }
 
-#define DIR_HANDLE "WIN32_FIND_DATA"
-struct diriter {
-	HANDLE hf;
-	int first;
-	WIN32_FIND_DATA fd;
-};
+#define DIR_HANDLE "DIR*"
 
 /* ...diriter... -- ...diriter... pathname */
 static int diriter_getpathname(lua_State *L, int index)
@@ -238,32 +248,18 @@ static int diriter_setpathname(lua_State *L, int index)
 /* diriter -- diriter */
 static int diriter_close(lua_State *L)
 {
-	struct diriter *pi = lua_touserdata(L, 1);
-	if (pi->hf != INVALID_HANDLE_VALUE) {
-		FindClose(pi->hf);
-		pi->hf = INVALID_HANDLE_VALUE;
-	}
+	DIR **pd = lua_touserdata(L, 1);
+	closedir(*pd);
+	*pd = 0;
 	lua_pushnil(L);
 	diriter_setpathname(L, 1);
 	return 0;
 }
 
-static int isdotfile(const char *filename)
+static int isdotfile(const char *name)
 {
-	return filename[0] == '.' &&
-		(filename[1] == '\0' || (filename[1] == '.' && filename[2] == '\0'));
-}
-
-static int nextfile(struct diriter *pi)
-{
-	if (!pi->first || isdotfile(pi->fd.cFileName))
-		do if (!FindNextFile(pi->hf, &pi->fd)) {
-			FindClose(pi->hf);
-			pi->hf = INVALID_HANDLE_VALUE;
-			return 0;
-		} while (isdotfile(pi->fd.cFileName));
-	pi->first = 0;
-	return 1;
+	return name[0] == '.' && (name[1] == '\0'
+		|| (name[1] == '.' && name[2] == '\0'));
 }
 
 /* pathname -- iter state nil */
@@ -271,31 +267,29 @@ static int nextfile(struct diriter *pi)
 static int ex_dir(lua_State *L)
 {
 	const char *pathname;
-	struct diriter *pi;
+	DIR **pd;
+	const WIN32_FIND_DATA *d;
 	switch (lua_type(L, 1)) {
 	default: return luaL_typerror(L, 1, "pathname");
 	case LUA_TSTRING:
-		lua_pushvalue(L, 1);                /* pathname ... pathname */
-		lua_pushliteral(L, "\\*");          /* pathname ... pathname "\\*" */
-		lua_concat(L, 2);                   /* pathname ... pattern */
-		pathname = lua_tostring(L, -1);
-		lua_pushcfunction(L, ex_dir);       /* pathname ... pat iter */
-		pi = lua_newuserdata(L, sizeof *pi);/* pathname ... pat iter state */
-		pi->hf = FindFirstFile(pathname, &pi->fd);
-		if (pi->hf == INVALID_HANDLE_VALUE)
-			return windows_pushlasterror(L);
-		pi->first = 1;
-		luaL_getmetatable(L, DIR_HANDLE);   /* pathname ... pat iter state M */
-		lua_setmetatable(L, -2);            /* pathname ... pat iter state */
-		lua_pushvalue(L, 1);                /* pathname ... pat iter state pathname */
-		diriter_setpathname(L, -2);         /* pathname ... pat iter state */
+		pathname = lua_tostring(L, 1);
+		lua_pushcfunction(L, ex_dir);       /* pathname ... iter */
+		pd = lua_newuserdata(L, sizeof *pd);/* pathname ... iter state */
+		*pd = opendir(pathname);
+		if (!*pd) return push_error(L);
+		luaL_getmetatable(L, DIR_HANDLE);   /* pathname ... iter state M */
+		lua_setmetatable(L, -2);            /* pathname ... iter state */
+		lua_pushvalue(L, 1);                /* pathname ... iter state pathname */
+		diriter_setpathname(L, -2);         /* pathname ... iter state */
 		return 2;
 	case LUA_TUSERDATA:
-		pi = luaL_checkudata(L, 1, DIR_HANDLE);
-		if (!nextfile(pi)) return 0;
+		pd = luaL_checkudata(L, 1, DIR_HANDLE);
+		do d = readdir(*pd);
+		while (d && isdotfile(d->cFileName));
+		if (!d) return push_error(L);
 		new_dirent(L);                      /* diriter ... entry */
 		diriter_getpathname(L, 1);          /* diriter ... entry dirpath */
-		lua_pushstring(L, pi->fd.cFileName);/* diriter ... entry dirpath name */
+		lua_pushstring(L, d->cFileName);    /* diriter ... entry dirpath name */
 		lua_pushvalue(L, -1);               /* diriter ... entry dirpath name name */
 		lua_setfield(L, -4, "name");        /* diriter ... entry dirpath name */
 		lua_concat(L, 2);                   /* diriter ... entry fullpath */
@@ -326,8 +320,7 @@ static int file_lock(lua_State *L, FILE *f, const char *mode, long offset, long
 	ret = flags ? LockFileEx(h, flags, 0, len.LowPart, len.HighPart, &ov)
 		: UnlockFileEx(h, 0, len.LowPart, len.HighPart, &ov);
 	if (!ret)
-		return windows_pushlasterror(L);
-	/* return the file */
+		return push_error(L);
 	lua_settop(L, 1);
 	return 1;
 }
@@ -351,33 +344,16 @@ static int ex_unlock(lua_State *L)
 }
 
 
-static int make_pipe(FILE **i, FILE **o)
+/* -- in out/nil error */
+static int ex_pipe(lua_State *L)
 {
 	HANDLE ph[2];
-	if (0 == CreatePipe(ph+0, ph+1, 0, 0))
-		return 0;
+	if (!CreatePipe(ph + 0, ph + 1, 0, 0))
+		return push_error(L);
 	SetHandleInformation(ph[0], HANDLE_FLAG_INHERIT, 0);
 	SetHandleInformation(ph[1], HANDLE_FLAG_INHERIT, 0);
-	*i = _fdopen(_open_osfhandle((long)ph[0], _O_RDONLY), "r");
-	*o = _fdopen(_open_osfhandle((long)ph[1], _O_WRONLY), "w");
-	return 1;
-}
-
-#define new_file(L) lua_newuserdata(L, sizeof(FILE *))
-
-/* -- in out/nil error */
-static int ex_pipe(lua_State *L)
-{
-	FILE *i, *o, **pf;
-	if (!make_pipe(&i, &o))
-		return windows_pushlasterror(L);
-	luaL_getmetatable(L, LUA_FILEHANDLE);   /* M */
-	*(pf = new_file(L)) = i;                /* M i */
-	lua_pushvalue(L, -2);                   /* M i M */
-	lua_setmetatable(L, -2);                /* M i */
-	*(pf = new_file(L)) = o;                /* M i o */
-	lua_pushvalue(L, -3);                   /* M i o M */
-	lua_setmetatable(L, -2);                /* M i o */
+	new_file(L, ph[0], _O_RDONLY, "r");
+	new_file(L, ph[1], _O_WRONLY, "w");
 	return 2;
 }
 
@@ -386,7 +362,7 @@ static void get_redirect(lua_State *L, int idx, const char *stdname, struct spaw
 {
 	lua_getfield(L, idx, stdname);
 	if (!lua_isnil(L, -1))
-		spawn_param_redirect(p, stdname, check_file(L, -1, stdname));
+		spawn_param_redirect(p, stdname, file_handle(check_file(L, -1, stdname)));
 	lua_pop(L, 1);
 }
 
@@ -456,6 +432,7 @@ static int ex_spawn(lua_State *L)
 		default: return luaL_error(L, "bad env option (table expected, got %s)",
 			luaL_typename(L, -1));
 		case LUA_TNIL:
+			break;
 		case LUA_TTABLE:
 			spawn_param_env(params);            /* cmd opts ... */
 			break;
@@ -468,11 +445,11 @@ static int ex_spawn(lua_State *L)
 	return spawn_param_execute(params);         /* proc/nil error */
 }
 
+
 /* copy the fields given in 'l' from one table to another; insert missing fields */
 static void copy_fields(lua_State *L, const luaL_reg *l, int from, int to)
 {
-	to = absindex(L, to);
-	for (; l->name; l++) {
+	for (to = absindex(L, to); l->name; l++) {
 		lua_getfield(L, from, l->name);
 		if (lua_isnil(L, -1)) {
 			lua_pop(L, 1);
@@ -533,6 +510,7 @@ int luaopen_ex(lua_State *L)
 	lua_getglobal(L, "io");                     /* ex . io */
 	if (lua_isnil(L, -1)) return luaL_error(L, "io not loaded");
 	copy_fields(L, ex_iolib, 1, -1);            /* ex . io */
+	copy_fields(L, ex_iofile_methods, 1, -1);   /* ex . io */
 	lua_getfield(L, 1, "pipe");                 /* ex . io ex_pipe */
 	lua_getfield(L, -2, "stderr");              /* ex . io ex_pipe io_stderr */
 	lua_getfenv(L, -1);                         /* ex . io ex_pipe io_stderr E */
diff --git a/w32api/pusherror.h b/w32api/pusherror.h
index 3e33a94..9105332 100755
--- a/w32api/pusherror.h
+++ b/w32api/pusherror.h
@@ -1,8 +1,8 @@
 #ifndef pusherror_h
 #define pusherror_h
 
-#include <lua.h>
 #include <windows.h>
+#include "lua.h"
 
 int windows_pusherror(lua_State *L, DWORD error, int nresults);
 #define windows_pushlasterror(L) windows_pusherror(L, GetLastError(), -2)
diff --git a/w32api/spawn.c b/w32api/spawn.c
index 08c7ad5..1f099c7 100755
--- a/w32api/spawn.c
+++ b/w32api/spawn.c
@@ -1,11 +1,10 @@
 #include <stdlib.h>
-
-#include <lua.h>
-#include <lauxlib.h>
-
 #include <windows.h>
 #include <io.h>
 
+#include "lua.h"
+#include "lauxlib.h"
+
 #include "spawn.h"
 #include "pusherror.h"
 
@@ -81,11 +80,6 @@ void spawn_param_env(struct spawn_params *p)
 {
 	lua_State *L = p->L;
 	luaL_Buffer env;
-	if (lua_isnil(L, -1)) {
-		p->environment = 0;
-		lua_pop(L, 1);
-		return;
-	}
 	/* convert env table to zstring list */
 	/* {nam1=val1,nam2=val2} => "nam1=val1\0nam2=val2\0\0" */
 	luaL_buffinit(L, &env);
@@ -108,9 +102,8 @@ void spawn_param_env(struct spawn_params *p)
 	p->environment = lua_tostring(L, -1);
 }
 
-void spawn_param_redirect(struct spawn_params *p, const char *stdname, FILE *f)
+void spawn_param_redirect(struct spawn_params *p, const char *stdname, HANDLE h)
 {
-	HANDLE h = file_handle(f);
 	SetHandleInformation(h, HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT);
 	if (!(p->si.dwFlags & STARTF_USESTDHANDLES)) {
 		p->si.hStdInput  = GetStdHandle(STD_INPUT_HANDLE);
diff --git a/w32api/spawn.h b/w32api/spawn.h
index 0c484b7..30caf56 100755
--- a/w32api/spawn.h
+++ b/w32api/spawn.h
@@ -1,8 +1,8 @@
 #ifndef SPAWN_H
 #define SPAWN_H
-#include <lua.h>
 
 #include <windows.h>
+#include "lua.h"
 
 #define PROCESS_HANDLE "process"
 struct process;
@@ -12,7 +12,7 @@ struct spawn_params *spawn_param_init(lua_State *L);
 void spawn_param_filename(struct spawn_params *p, const char *filename);
 void spawn_param_args(struct spawn_params *p);
 void spawn_param_env(struct spawn_params *p);
-void spawn_param_redirect(struct spawn_params *p, const char *stdname, FILE *f);
+void spawn_param_redirect(struct spawn_params *p, const char *stdname, HANDLE h);
 int spawn_param_execute(struct spawn_params *p);
 
 int process_wait(lua_State *L);