Can I transfer Ultiboard files to other PCB layout software packages via DXF export/import?
It is possible to make Ultiboard export an uncompressed XML .ewprj file by activating its 'Internal options'. Then you can write your own converter e.g. to Eagle or some other non-proprietary format, but the XML is quite complex and the thing needs some time.
To activate these internal options a binary patch to a DLL is required; once the existence of this option is known, one can find it in a few minutes with a good disassembler. But this is reverse-engineering (NOT cracking!!) stuff and I can't post more details. Maybe I will write the converter myself some day.
Fabio