Converting .mt2s files to .avi format.
Converting .mt2s files directly to Audio Video Interleave Files (.mt2s to .avi conversion) is not possible, since .mt2s is a non-existing format.
Perhaps this is just a typo, and you are actually searching for ways how to convert Blu-ray BDAV Video Files to Audio Video Interleave Files. In that case, please refer to the .m2ts to .avi conversion entry.
In a word, direct mt2s to avi conversion is not possible.
So don't expect any so-called mt2s to avi converter or mt2s to avi free online conversion tool available.
The database currently does not contain any mt2s software converter.