hex editing multiple files

The Sims 1 has sound files in XA format. I can convert them with Audacity to wav or mp3. However Audacity refuses to load most of them because they have a broken(?) header. A simple hex edit can fix this but there are over 3000 files and I have only extracted them from the Makin' Magic addon.

Is there a way to fix all the files in one go? I really don't want to edit each file manually.