MSA

I purchased Express Scribe Pro and have had this software program for the last few years to perform my transcription work. I recently received work last week in htm format and partial file formats that are incompatible with Express Scribe Pro, so Express Scribe would not load these. These formats are not listed under the audio file format section of file formats that can be loaded with Express Scribe. Can I use a converter to rectify this? Thank you for your response. MSA