Renaming the pck may not be necessary, was able to run the files after extraction only anyways without changing the assets.sparsepck file name.
Error: Couldn't load project data at path "/home/user/Downloads/MMX Regenesis 1.00.0 SteamDeck". Is the .pck file missing?
If you've renamed the executable, the associated .pck file should also be renamed to match the executable's name (without the extension).
