File | Flregkey.reg

I need to start with an important : The .reg file extension is used for Windows Registry files. Editing the Registry can be dangerous and may cause system instability or software malfunctions. Always back up your Registry before making any changes.

: If you don't know exactly which program created flregkey.reg , do not run it. Delete it or scan it thoroughly first.

That said, a file named is not a standard Windows system file. It is almost certainly associated with a specific third-party software application.