.RMHD File

The rmhd file extension is associated with the RealMedia High Definition, a multimedia codec, which is used to reduce file size while maintaining image quality when saving HD videos.

RealMedia HD technology increases compression efficiency by 30% - 45% compared to MP4.

How to open:

Use compatible tools to playback *.rmhd files to other formats.

How to convert:

Probably can be exported to other formats.