Often, such files are created to add content, fix bugs, or improve graphics in fan projects or indie games. To give you better info, I need to know:

is this file supposed to do (e.g., is it a game, a patch)?

Knowing these details helps me verify if it's safe and tell you exactly how to use it.

Run a scan with Windows Defender or a reputable third-party antivirus before executing.

Follow the on-screen prompts for the anniversary edition update.