Files with bel extension can be found as doorbells for InDoors Space by Abyx. Looks like some sort of audio file.
There are 3 other file types using
the BEL file extension!
.bel - Beamer layout data
.bel - HPXView binary event log archive file
.bel - Belon compressed archive
What is bel file? How to open bel files?
The bel file extension is also used in InDoors Spaces solution by Abyx. A .bel file is a "doorbell" for gaining access to an InDoors Space, perhaps audio file.
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