If its a file positioning issue I always Zip with folder info intact and instruct to un-zip similar. My instructions read:-

Extract the files to the root directory on which you have installed your Poser program. For example if Poser is installed in C:Program FilesMetaCreationsPoser 4 then the root directory will be C: . Then by selecting "use folder names" in WinZip files will be correctly positioned automatically. If you prefer to do it manually the files should be placed thus:-

I then type in the paths.

Even after this I still need to give some folks a hand... no biggie I did not find it easy myself to start with.

If its a file format issue, are you delivering Photoshop PSD's? I think most graphical programs will open them but you may need to explain this.

Failing that it may be a PSU error .....ooops! :)