I'm hoping someone can help me, (also hoping this is the correct place to pose questions not covered in the FAQ)
I get an error on launch of "Unknown error when launching the game: Could not find a part of the path 'D:\Program Files (x86)\Steam\steamapps\common\FINAL FANTASY VII\data\movies\ending2.avi'."

The path is correct as far as where the movies are stored, and the file which causes the error also exists within said directory.

If I try to launch without mods, I get the same issue. If I try to launch with minimal validation I get a prompt to insert disk 1 2 or 3, (Which because Steam version, I don't have.)
I've tried downloading multiple different versions of ending2 and replacing it within the folder, same problem persists. I've tried deleting (after backup) all of the movies, and then redownloading a relevant mod to try that way, also to no avail.
I'm not sure what else I can try, any suggestions would be appreciated.