MPROJ projects file comes from only one software, and that is the iMovie Movie Maker. As is typical for any project files, these can only be exported with the original program and only if you have all the multimedia data referenced in the project.
On its own, .mproj file is just an XML file that stores changes made to the original video, not the original, which means single .mproj files is useless, and mproj to wmv export (to Windows Media Video) is simply not possible without the original video file.
Free version iMovie (trial) can be downloaded from the developers website, but leaves watermark.
Updated: February 5, 2024