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Check this description of ofx file extension en

Its a The .ofx file extension is also used for Olicom Fax image files, which are used in electronic Fax documents. The OFX files used by this application contain images of the faxes that are sent and received with the fax application.

Probably you should check with Olicom Fax, to know if they convert its file format or is a file format similar to TIFF or another commond graphics format.