The m1pg file extension is associated with the iFinish video format.
M1PG file extension - iFinish video file
What is m1pg file? How to open m1pg files?
File type specification:
The m1pg file extension was used by now no longer developed video editing program called iFinish, which was later replaced by Media 100.
An *.m1pg file contains saved video clip.
This m1pg file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.