hbebiz

I am new to Express Scribe and when I put the file I wanted to dictate into it, I got this error message "unable to open dct or wav file because audio compression codec is not installed on this computer or file is corrupt. If persists, see nch.au.com/acm for more info on codecs." I have no idea what this means and what I am supposed to do. Please help! I use Express Scribe as a medical transcriptionist retrieving dictation. Thanks in advance. Hersh