BM Proxy Generator converting to .mov

I'm on a win machine and attempting to proxy down DJI Phantom 4 Pro mp4 2.4.0 4K footage to 264 Half Res 1080p
Resultant proxies are all converting to mov files.
Did another test on a different camera (Sony 6300) - with a different codec. Same issue. All files end up as mov files as testied through MediaInfo.
Why would a transcode occur from h264 to mov when there isn't even a button to select such conversion.
The Project Properties in setting are set for h264.
Any ideas...thx
Resultant proxies are all converting to mov files.
Did another test on a different camera (Sony 6300) - with a different codec. Same issue. All files end up as mov files as testied through MediaInfo.
Why would a transcode occur from h264 to mov when there isn't even a button to select such conversion.
The Project Properties in setting are set for h264.
Any ideas...thx