Sending DOCs as attachment via YajHFC

I am using Hylafax server and YajHFC client.
My client can only send PDF files as attachment and no doc files.
When they try to attach doc files the YajHFC client ignores them and sends the fax without the docs.

Does anybody know a good Hylafax client that is able to convert DOCs to postscript and send them as well as PDFs as a fax?

Or alternatively maybe some other fax server/client that is able to work with DOCs and FreePBX?

Many thanks