Many third-party voice memo or call recording apps use this naming convention for active recordings.
Apps like GarageBand or Audacity may create .tmp or RecordTMP files while you are recording to ensure data isn't lost if the program closes unexpectedly. How to Access or Fix the File RecordTMP (32) m4a
VLC Media Player can often play "broken" or unfinalized files that other players can't. Import as "Raw Data" in Audacity: Download Audacity . Go to File > Import > Raw Data . Many third-party voice memo or call recording apps