--- a/src/fileio.c
+++ b/src/fileio.c
@@ -41,7 +41,7 @@ static char_u *readfile_charconvert(char
 static void check_marks_read(void);
 #endif
 #ifdef FEAT_CRYPT
-static char_u *check_for_cryptkey(char_u *cryptkey, char_u *ptr, long *sizep, off_t *filesizep, int newfile, char_u *fname, int *did_ask);
+static char_u *check_for_cryptkey(char_u *cryptkey, char_u *ptr, long *sizep, off_T *filesizep, int newfile, char_u *fname, int *did_ask);
 #endif
 #ifdef UNIX
 static void set_file_time(char_u *fname, time_t atime, time_t mtime);
@@ -49,7 +49,7 @@ static void set_file_time(char_u *fname,
 static int set_rw_fname(char_u *fname, char_u *sfname);
 static int msg_add_fileformat(int eol_type);
 static void msg_add_eol(void);
-static int check_mtime(buf_T *buf, struct stat *s);
+static int check_mtime(buf_T *buf, stat_T *s);
 static int time_differs(long t1, long t2);
 #ifdef FEAT_AUTOCMD
 static int apply_autocmds_exarg(event_T event, char_u *fname, char_u *fname_io, int force, buf_T *buf, exarg_T *eap);
@@ -245,7 +245,7 @@ readfile(
     colnr_T	len;
     long	size = 0;
     char_u	*p;
-    off_t	filesize = 0;
+    off_T	filesize = 0;
     int		skip_read = FALSE;
 #ifdef FEAT_CRYPT
     char_u	*cryptkey = NULL;
@@ -269,7 +269,7 @@ readfile(
 #endif
     int		fileformat = 0;		/* end-of-line format */
     int		keep_fileformat = FALSE;
-    struct stat	st;
+    stat_T	st;
     int		file_readonly;
     linenr_T	skip_count = 0;
     linenr_T	read_count = 0;
@@ -885,7 +885,7 @@ readfile(
 		/* Read the first line (and a bit more).  Immediately rewind to
 		 * the start of the file.  If the read() fails "len" is -1. */
 		len = read_eintr(fd, firstline, 80);
-		lseek(fd, (off_t)0L, SEEK_SET);
+		vim_lseek(fd, (off_T)0L, SEEK_SET);
 		for (p = firstline; p < firstline + len; ++p)
 		    if (*p >= 0x80)
 		    {
@@ -949,7 +949,7 @@ retry:
 	    read_buf_lnum = 1;
 	    read_buf_col = 0;
 	}
-	else if (read_stdin || lseek(fd, (off_t)0L, SEEK_SET) != 0)
+	else if (read_stdin || vim_lseek(fd, (off_T)0L, SEEK_SET) != 0)
 	{
 	    /* Can't rewind the file, give up. */
 	    error = TRUE;
@@ -2253,7 +2253,8 @@ rewind_retry:
 				if (   try_unix
 				    && !read_stdin
 				    && (read_buffer
-					|| lseek(fd, (off_t)0L, SEEK_SET) == 0))
+					|| vim_lseek(fd, (off_T)0L, SEEK_SET)
+									  == 0))
 				{
 				    fileformat = EOL_UNIX;
 				    if (set_options)
@@ -2958,7 +2959,7 @@ check_for_cryptkey(
     char_u	*cryptkey,	/* previous encryption key or NULL */
     char_u	*ptr,		/* pointer to read bytes */
     long	*sizep,		/* length of read bytes */
-    off_t	*filesizep,	/* nr of bytes used from file */
+    off_T	*filesizep,	/* nr of bytes used from file */
     int		newfile,	/* editing a new buffer */
     char_u	*fname,		/* file name to display */
     int		*did_ask)	/* flag: whether already asked for key */
@@ -3145,7 +3146,7 @@ buf_write(
     int		    overwriting;	    /* TRUE if writing over original */
     int		    no_eol = FALSE;	    /* no end-of-line written */
     int		    device = FALSE;	    /* writing to a device */
-    struct stat	    st_old;
+    stat_T	    st_old;
     int		    prev_got_int = got_int;
     int		    file_readonly = FALSE;  /* overwritten file is read-only */
     static char	    *err_readonly = "is read-only (cannot override: \"W\" in 'cpoptions')";
@@ -3674,7 +3675,7 @@ buf_write(
     if (!(append && *p_pm == NUL) && !filtering && perm >= 0 && dobackup)
     {
 #if defined(UNIX) || defined(WIN32)
-	struct stat st;
+	stat_T	    st;
 #endif
 
 	if ((bkc & BKC_YES) || append)	/* "yes" */
@@ -3813,7 +3814,7 @@ buf_write(
 	    int		bfd;
 	    char_u	*copybuf, *wp;
 	    int		some_error = FALSE;
-	    struct stat	st_new;
+	    stat_T	st_new;
 	    char_u	*dirp;
 	    char_u	*rootname;
 #if defined(UNIX)
@@ -4343,7 +4344,7 @@ buf_write(
 	if (errmsg == NULL)
 	{
 #ifdef UNIX
-	    struct stat	st;
+	    stat_T	st;
 
 	    /* Don't delete the file when it's a hard or symbolic link. */
 	    if ((!newfile && st_old.st_nlink > 1)
@@ -4376,7 +4377,7 @@ buf_write(
 
 restore_backup:
 	{
-	    struct stat st;
+	    stat_T	st;
 
 	    /*
 	     * If we failed to open the file, we don't need a backup. Throw it
@@ -4673,7 +4674,7 @@ restore_backup:
     if (backup != NULL && !backup_copy)
     {
 # ifdef HAVE_FCHOWN
-	struct stat	st;
+	stat_T	st;
 
 	/* don't change the owner when it's already OK, some systems remove
 	 * permission or ACL stuff */
@@ -4929,7 +4930,7 @@ restore_backup:
 
 	if (backup != NULL)
 	{
-	    struct stat st;
+	    stat_T	st;
 
 	    /*
 	     * If the original file does not exist yet
@@ -5221,7 +5222,7 @@ msg_add_fileformat(int eol_type)
 msg_add_lines(
     int	    insert_space,
     long    lnum,
-    off_t   nchars)
+    off_T   nchars)
 {
     char_u  *p;
 
@@ -5233,6 +5234,9 @@ msg_add_lines(
 #ifdef LONG_LONG_OFF_T
 	sprintf((char *)p,
 		"%ldL, %lldC", lnum, (long long)nchars);
+#elif defined(WIN3264)
+	sprintf((char *)p,
+		"%ldL, %I64dC", lnum, (__int64)nchars);
 #else
 	sprintf((char *)p,
 		/* Explicit typecast avoids warning on Mac OS X 10.6 */
@@ -5251,6 +5255,9 @@ msg_add_lines(
 #ifdef LONG_LONG_OFF_T
 	    sprintf((char *)p,
 		    _("%lld characters"), (long long)nchars);
+#elif defined(WIN3264)
+	    sprintf((char *)p,
+		    _("%I64d characters"), (__int64)nchars);
 #else
 	    sprintf((char *)p,
 		    /* Explicit typecast avoids warning on Mac OS X 10.6 */
@@ -5274,7 +5281,7 @@ msg_add_eol(void)
  * using the same timestamp but can't set the size.
  */
     static int
-check_mtime(buf_T *buf, struct stat *st)
+check_mtime(buf_T *buf, stat_T *st)
 {
     if (buf->b_mtime_read != 0
 	    && time_differs((long)st->st_mtime, buf->b_mtime_read))
@@ -6441,7 +6448,7 @@ vim_rename(char_u *from, char_u *to)
 #ifdef AMIGA
     BPTR	flock;
 #endif
-    struct stat	st;
+    stat_T	st;
     long	perm;
 #ifdef HAVE_ACL
     vim_acl_T	acl;		/* ACL from original file */
@@ -6469,7 +6476,7 @@ vim_rename(char_u *from, char_u *to)
 
 #ifdef UNIX
     {
-	struct stat	st_to;
+	stat_T	st_to;
 
 	/* It's possible for the source and destination to be the same file.
 	 * This happens when "from" and "to" differ in case and are on a FAT32
@@ -6768,7 +6775,7 @@ buf_check_timestamp(
     buf_T	*buf,
     int		focus UNUSED)	/* called for GUI focus event */
 {
-    struct stat	st;
+    stat_T	st;
     int		stat_res;
     int		retval = 0;
     char_u	*path;
@@ -6780,7 +6787,7 @@ buf_check_timestamp(
 #if defined(FEAT_CON_DIALOG) || defined(FEAT_GUI_DIALOG)
     int		can_reload = FALSE;
 #endif
-    off_t	orig_size = buf->b_orig_size;
+    off_T	orig_size = buf->b_orig_size;
     int		orig_mode = buf->b_orig_mode;
 #ifdef FEAT_GUI
     int		save_mouse_correct = need_mouse_correct;
@@ -7209,7 +7216,7 @@ buf_reload(buf_T *buf, int orig_mode)
 }
 
     void
-buf_store_time(buf_T *buf, struct stat *st, char_u *fname UNUSED)
+buf_store_time(buf_T *buf, stat_T *st, char_u *fname UNUSED)
 {
     buf->b_mtime = (long)st->st_mtime;
     buf->b_orig_size = st->st_size;
@@ -7349,7 +7356,7 @@ vim_tempname(
     static char	*(tempdirs[]) = {TEMPDIRNAMES};
     int		i;
 # ifndef EEXIST
-    struct stat	st;
+    stat_T	st;
 # endif
 
     /*