P5 can use BUM files. Provided there is one. However, just changing a greyscale bumpmap's extension to BUM won't work. PPP AND P5 will not automatically internally convert a file with a BUM extension and the results won't work right. Rather you should point the file at the jpeg instead. And convince distributors to try my big BUM solution (see elsewhere for like dizens of threads on this here, PT, and the Merchants' forum) that way two files are provided and the one for the version is installed.