diff --git a/lib/std/fs.zig b/lib/std/fs.zig
index bac4c42ff860..99936e9abd76 100644
--- a/lib/std/fs.zig
+++ b/lib/std/fs.zig
@@ -160,7 +160,7 @@ pub fn makeDirAbsoluteZ(absolute_path_z: [*:0]const u8) !void {
 /// Same as `makeDirAbsolute` except the parameter is a null-terminated WTF-16 LE-encoded string.
 pub fn makeDirAbsoluteW(absolute_path_w: [*:0]const u16) !void {
     assert(path.isAbsoluteWindowsW(absolute_path_w));
-    return posix.mkdirW(absolute_path_w, Dir.default_mode);
+    return posix.mkdirW(mem.span(absolute_path_w), Dir.default_mode);
 }
 
 /// Same as `Dir.deleteDir` except the path is absolute.
@@ -181,7 +181,7 @@ pub fn deleteDirAbsoluteZ(dir_path: [*:0]const u8) !void {
 /// Same as `deleteDirAbsolute` except the path parameter is WTF-16 and target OS is assumed Windows.
 pub fn deleteDirAbsoluteW(dir_path: [*:0]const u16) !void {
     assert(path.isAbsoluteWindowsW(dir_path));
-    return posix.rmdirW(dir_path);
+    return posix.rmdirW(mem.span(dir_path));
 }
 
 /// Same as `Dir.rename` except the paths are absolute.
@@ -221,7 +221,7 @@ pub fn renameZ(old_dir: Dir, old_sub_path_z: [*:0]const u8, new_dir: Dir, new_su
 /// Same as `rename` except the parameters are WTF16LE, NT prefixed.
 /// This function is Windows-only.
 pub fn renameW(old_dir: Dir, old_sub_path_w: []const u16, new_dir: Dir, new_sub_path_w: []const u16) !void {
-    return posix.renameatW(old_dir.fd, old_sub_path_w, new_dir.fd, new_sub_path_w);
+    return posix.renameatW(old_dir.fd, old_sub_path_w, new_dir.fd, new_sub_path_w, windows.TRUE);
 }
 
 /// Returns a handle to the current working directory. It is not opened with iteration capability.
@@ -338,7 +338,7 @@ pub fn createFileAbsoluteZ(absolute_path_c: [*:0]const u8, flags: File.CreateFla
 /// Same as `createFileAbsolute` but the path parameter is WTF-16 encoded.
 pub fn createFileAbsoluteW(absolute_path_w: [*:0]const u16, flags: File.CreateFlags) File.OpenError!File {
     assert(path.isAbsoluteWindowsW(absolute_path_w));
-    return cwd().createFileW(absolute_path_w, flags);
+    return cwd().createFileW(mem.span(absolute_path_w), flags);
 }
 
 /// Delete a file name and possibly the file it refers to, based on an absolute path.
@@ -362,7 +362,7 @@ pub fn deleteFileAbsoluteZ(absolute_path_c: [*:0]const u8) Dir.DeleteFileError!v
 /// Same as `deleteFileAbsolute` except the parameter is WTF-16 encoded.
 pub fn deleteFileAbsoluteW(absolute_path_w: [*:0]const u16) Dir.DeleteFileError!void {
     assert(path.isAbsoluteWindowsW(absolute_path_w));
-    return cwd().deleteFileW(absolute_path_w);
+    return cwd().deleteFileW(mem.span(absolute_path_w));
 }
 
 /// Removes a symlink, file, or directory.
@@ -400,7 +400,7 @@ pub fn readLinkAbsolute(pathname: []const u8, buffer: *[max_path_bytes]u8) ![]u8
 /// encoded.
 pub fn readlinkAbsoluteW(pathname_w: [*:0]const u16, buffer: *[max_path_bytes]u8) ![]u8 {
     assert(path.isAbsoluteWindowsW(pathname_w));
-    return posix.readlinkW(pathname_w, buffer);
+    return posix.readlinkW(mem.span(pathname_w), buffer);
 }
 
 /// Same as `readLink`, except the path parameter is null-terminated.
@@ -437,13 +437,13 @@ pub fn symLinkAbsolute(
 /// like to create a symbolic link to a directory, specify this with `SymLinkFlags{ .is_directory = true }`.
 /// See also `symLinkAbsolute`, `symLinkAbsoluteZ`.
 pub fn symLinkAbsoluteW(
-    target_path_w: []const u16,
-    sym_link_path_w: []const u16,
+    target_path_w: [*:0]const u16,
+    sym_link_path_w: [*:0]const u16,
     flags: Dir.SymLinkFlags,
 ) !void {
-    assert(path.isAbsoluteWindowsWTF16(target_path_w));
-    assert(path.isAbsoluteWindowsWTF16(sym_link_path_w));
-    return windows.CreateSymbolicLink(null, sym_link_path_w, target_path_w, flags.is_directory);
+    assert(path.isAbsoluteWindowsW(target_path_w));
+    assert(path.isAbsoluteWindowsW(sym_link_path_w));
+    return windows.CreateSymbolicLink(null, mem.span(sym_link_path_w), mem.span(target_path_w), flags.is_directory);
 }
 
 /// Same as `symLinkAbsolute` except the parameters are null-terminated pointers.
diff --git a/lib/std/fs/Dir.zig b/lib/std/fs/Dir.zig
index d504ecb0c436..fab9679838b3 100644
--- a/lib/std/fs/Dir.zig
+++ b/lib/std/fs/Dir.zig
@@ -1134,7 +1134,7 @@ pub fn makeDirZ(self: Dir, sub_path: [*:0]const u8) MakeError!void {
 /// To create multiple directories to make an entire path, see `makePath`.
 /// To operate on only absolute paths, see `makeDirAbsoluteW`.
 pub fn makeDirW(self: Dir, sub_path: [*:0]const u16) MakeError!void {
-    try posix.mkdiratW(self.fd, sub_path, default_mode);
+    try posix.mkdiratW(self.fd, mem.span(sub_path), default_mode);
 }
 
 /// Calls makeDir iteratively to make an entire path
@@ -1763,7 +1763,7 @@ pub fn renameZ(self: Dir, old_sub_path_z: [*:0]const u8, new_sub_path_z: [*:0]co
 /// Same as `rename` except the parameters are WTF16LE, NT prefixed.
 /// This function is Windows-only.
 pub fn renameW(self: Dir, old_sub_path_w: []const u16, new_sub_path_w: []const u16) RenameError!void {
-    return posix.renameatW(self.fd, old_sub_path_w, self.fd, new_sub_path_w);
+    return posix.renameatW(self.fd, old_sub_path_w, self.fd, new_sub_path_w, windows.TRUE);
 }
 
 /// Use with `Dir.symLink`, `Dir.atomicSymLink`, and `symLinkAbsolute` to