Hi, Chris. I have been getting these M4a files from the same person for years. I've started using a new PC, hence the purchase.... again. Every time I get a new PC (which I do almost yearly), I buy a new Express because I can't just keep using the one I already purchased, which is ridiculous! Since this new version, I can't load m4a files. Please don't talk to me about encoders and all sorts of other crap. Please just make it work. The error says that the format is not supported by Express Scribe. I purchased this, and it's not cheap. I expect it to work!