It depends on the source. A malicious .reg file can:
If you meant something else (e.g., a specific software patch or a different game), please let me know! file regedit ff 2021
You can see how these registry files are applied and their impact on gameplay in these video guides: It depends on the source
: When searching for registry edits related to a specific file type or software, including the year can help narrow down results to more recent or relevant information. file regedit ff 2021