eFax Portable reader

I'd like to see a portable version of eFax, or a t least an application that can read the proprietary *.efx file. Any suggestions? I tried installing to regaular PC and then copying files, but it didn't work for me...Needs to install files to registry.

I also found some apps that were readers for UNIX or other operating systems, but I couldn't get them to work in Win XP environment.

Thanks in advance for any useful suggestions!