Comment 6 for bug 1568457

I can confirm this on Windows 10:
If I open a savegame.wgf or a saved map map.wmf 7-Zip shows no timestamp for "Last access","Changed on" and "Created on" for every file in the archive.

Of cource if you uncompress one of the archives or choose not to compress the files in widelands every file has a timestamp, the OS file system takes care of that.