PES 6 searches for a specific "text" file based on the language settings in your registry. If you have e_text.afs (English) but the game is looking for f_text.afs (French), it will throw the "File Not Found" error.
This error usually means the game can’t locate essential .afs archive files (like 0_text.afs , e_text.afs , or j_text.afs ) that store graphics, menus, and commentary data. pes 6 afs file not found