Conversion of temp files to mp4 file format

It is very unlikely that you can convert some random .temp files to .mp4 unless it was just some renamed multimedia file or a fragment of it, in which case it may be sometimes possible.

Temporary files are generated for many purposes and even if some contains fragments of any video or multimedia data, it is unlikely that you could reliably perform temp to mp4 conversion. You can always try to rename your .temp file to .mp4 and see if you can playback it, but chances for this are pretty low.

Open TEMP file    Open MP4 file