Recordtmp: (32) M4a

If the file doesn't have a proper dot before "m4a," try renaming it to RecordTMP (32).m4a to see if your computer recognizes it.

Many third-party voice memo or call recording apps use this naming convention for active recordings. RecordTMP (32) m4a

If the file won't play, it is likely missing its "header" (the data that tells a player how long the audio is). You can try these methods: If the file doesn't have a proper dot