I've been seeing this quite a bit more often recently, particularly with Norton. Most of the Pacrim imports/localizations are giving this, and the smaller company efforts seem to be too. Problem is that the AV programs aren't bothering to give us options at download any longer, like the option to add to the exception list. They just delete the file and expect you to wade through the AV's often cryptic interface to manually add in exceptions. If you can even figure out which files to place in the exception list. And, yeah, everybody's got their favorite AV program that doesn't flag the false positives, but we need the Big Guy programs to get on the ball and realize that we're not all buying their stuf to protect our spreadsheets and word processors.
I suppose I should look into the smaller AV efforts, but Norton's kept my computers free of problems for many years and I'm a bit leery of trusting others. My bad, I guess. But I really wish life wasn't removing my choices at every possible turn.