You can use the CShop prefabmaker program to convert .x to .csm, and the next version of the program will support .dds textures.
However, I am not familiar with the license for the FPSC artwork. You might only be able to use the artwork with FPSC. At the very least, you would need to purchase a commercial FPSC license in order to use the artwork in any project.
You should read the license, or ask Rich about it if the issue isn't mentioned.
WindowsXP Media Center Edition, Pentium 4 2.53 GHz CPU, 512 MB of RAM, GEForce4 MX 440