RushTX

I am using the free version, 5.56. I have transcribed videos before. However, this is the message I get when trying to open my file. "The WMV format is not supported by Express Scribe." On the NCH site it lists WMV as a supported file type. Any ideas what I could do or am doing wrong here? Other info: Using Windows 8 (the only thing different from last time I used ES for transcribing video files). Thank you in advance! Rushell