IPF is not supported yet. Here is Xport explanation:
"CAPS - For all the people who want to see CAPS support in WinUAEX, send an email to the following address:
and request for them to make a pure non-DLL, non-Windows static LIB available. CAPS is distributed as a DLL which is fine for Windows emulators, but this DLL is rife with Windows-specific calls that have no equivalent on the XBox. I already know that they have a LIB available for download on their website - but the LIB they have available is simply a wrapper around the DLL which makes the same Windows calls"
So Xport needs a dll that does not have any windows specific calls. AFAIK Antiriad has already contacted the CAPS crew in regards to this.