Done.exe -

The phrase "Done.EXE" is technically improper in standard written English but is used in digital slang to express that something has been definitively completed or "executed" like a computer program.

: If you are actually naming a computer file, .exe is the standard file extension for an executable program on Microsoft Windows . Done.EXE

: Use this for a simple, professional statement of completion. The phrase "Done

If you are looking for the grammatically correct or "proper" ways to write this, consider these alternatives based on your intent: Grammatically Correct Versions Done.EXE

What Does EXE Mean? | Windows Executable File Explained - ITarian