An smfmf file extension is related to some kind of audio file format.
SMFMF file extension - Audio data
What is smfmf file? How to open smfmf files?
File type specification:
The smfmf file extension is reported to be used for some sort of audio format. The smfmf file stores audio data.
The SMFMF audio format seems to be obsolete without support from developer or producer.
This smfmf 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.