Problems solved, files submited. Ended up using the .png format because both my paint progams agreed with it. I reduced the resolution to 1500x1500, a reasonable compromise I suppose. Final size of the .zip..... 16mb. preparing the texture only package (much easier!) I don't think .psds are auto compressed, before zipping the 2 files were over 70mb, after zipping they were just over 50mb. A difference of 20mb! Whew, that was messy. And to think now I've got to do Mike..... GROOOAAAAN.