The file extension OMF marks so-called Open Media Framework files. It is a standardized exchange format for professional audio / video content. That was developed by Avid.
The format, also known as the Open Media Framework Interchange (OMFI), is platform-independent and primarily serves to transfer media content and project data between different applications.
Please note that OMF files unfortunately can not always save all settings. This applies, for example, to non-standardized effects whose data could not then be evaluated in other applications. In addition, the formats of the associated audio / video data must be supported.
Meanwhile, the OMFI is being replaced by the MXF (Material Exchange Format).