Done.exe -

: Common for personal tasks or casual conversation.

: If you are specifically referring to a computer process that has finished running. Digital and Technical Contexts Done.EXE

What Does EXE Mean? | Windows Executable File Explained - ITarian : Common for personal tasks or casual conversation

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