The most frequent cause is Windows hiding known file extensions. You may have named a file filelist.xml , but Windows secretly appended .txt to the end, making it filelist.xml.txt .
Windows 10 and 11 treat older games like Far Cry 4 (2014) poorly, especially regarding file access permissions.
If nothing works, your installation is deeply corrupted. Uninstalling via Steam/Uplay leaves behind junk files.
Try these solutions in order. The first few are quick and often solve the issue for 80% of users.