What is .WFM file?
File generated by Pro Tools, a professional audio recording, editing, and mixing application; saves waveform information that Pro Tools has calculated for audio files; enables Pro Tools to display a preview of the waveform in the software.
WFM files act as a cache so that Pro Tools doesn't have to recalculate the audio form information each time a session is opened. WFM files are stored with Pro Tools session files (.PTX or .PTF).
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