Deal with NT paths in GetFinalPathNameByHandle

When calling QueryObjectName, NT namespaced paths can be returned. This
change appropriately strips the prefix to turn it into an absolute path.

(The above behaviour was observed at least in Wine so far)

lib/std/os/windows.zig

@@ -1224,7 +1224,21 @@ pub fn GetFinalPathNameByHandle(
             // TODO find out if a path can start with something besides `\Device\<volume name>`,
             // and if we need to handle it differently
             // (i.e. how to determine the start and end of the volume name in that case)
-            if (!mem.eql(u16, expected_prefix, final_path[0..expected_prefix.len])) return error.Unexpected;
+            if (!mem.eql(u16, expected_prefix, final_path[0..expected_prefix.len])) {
+                // Wine seems to return NT namespaced paths from QueryObjectName
+                // (e.g. `\??\Z:\some\path\to\a\file.txt`), in which case we can just strip the
+                // prefix to turn it into an absolute path
+                if (getNamespacePrefix(u16, final_path) == .nt) {
+                    const unprefixed_path = final_path[4..];
+                    // TODO: Handle other possible path types, only drive absolute has been observed so far
+                    if (getUnprefixedPathType(unprefixed_path) != .drive_absolute) {
+                        return error.Unexpected;
+                    }
+                    mem.copyForwards(u16, out_buffer[0..unprefixed_path.len], unprefixed_path);
+                    return out_buffer[0..unprefixed_path.len];
+                }
+                return error.Unexpected;
+            }
 
             const file_path_begin_index = mem.indexOfPos(u16, final_path, expected_prefix.len, &[_]u16{'\\'}) orelse unreachable;
             const volume_name_u16 = final_path[0..file_path_begin_index];