Could Not Find File Error

The most likely cause is a flag set somewhere that is making the game fail on launch. That flag is telling the game to try and launch "FileHere" which does not exist (as it is not a game file).

Can you please follow the instructions here: https://support.steampowered.com/kb_article.php?ref=1040-JWMT-2947

To bring up the Steam Launch Options, and remove any content you find there. You may also want to check the games executable directly.