In general, I would call it semantic drift (or language change). Some words, like to dial (a phone), blueprint, and blackboard (green or white), have a morpheme in them that is still transparent (the color words or the shape of a telephone dial), but others, like file, no longer do. But, if there is a term, tsuwm should have it and give it to us real soon.

File: from the word in Latin filum 'thread' for the red thread that held together multiple page documents. This morphed into a manila folder for filing papers, and now has become a named collection of bytes on some magnetic media. (Although, I suppose a string of bytes is still somehow connected to a thread.)

Ceci n'est pas un seing.