Deal with wine paths in GetFinalPathNameByHandle

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

Author: moosichu

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];