Yeah just did some testing on Afterplay and its loading the .state file even if you save in game and create the .sav file. If you try and load the .sav file its empty. No sure how to get the file off in that case.
Trying to edit a save file. Been playing using Afterplay.io and it allows you to download a .sav file.
When I tried to load the file I get this error:
Binary is not compatible with save file.
Current SAV generation: 9