Wiktionary
vb. 1 (context transitive English) to remove using a file (the tool) 2 (context intransitive English) to depart in single file
Usage examples of "file off".
It was bad enough that he and Lauren and Randall had read the thing, and that Mona, of all people, Mona had snatched up the file off his desk and read it in its entirety before anyone knew what had happened.
I could pretend I'd called to tell him I was dropping the file off late.
Lucas lucked into a metered parking spot a hundred yards from the Wells, got his file off the front seat, bought two hours of parking time, and walked across the street to the museum.
I'd dropped the Diaz file off at the CF offices before my meeting with Titus, so all I had with me were a few penciled notes.
Unfortunately for him, he knew he wouldn't be able to get the file off Manticore with him when he was expelled.