Mineral spirits is an awfully generic term, whether in paint store or art store terminology. Unless you've done specific advance testing, or know what is actually in it, and how pure that is, you're taking a risk. Often products are made or blended in big batch containers that get used for other things too, and contain residue contaminants. Many off-the-shelf solvents contain a fair amount of water. I do know solvents, and I do know film, and fluid mounting isn't unique to scanning. You'd want to see if something really does fully evaporate, how quickly, and if there truly is no residue. In the case of old fragile emulsions, as in photo restoration projects, just the expansion-contraction effect of wetting and sudden drying might cause a degree of emulsion frilling. I don't believe in generic answers because people on this forum work with a lot of different kinds and ages of film and paper. Better safe than sorry.