Last Saturday I bought a PowerBook G4...being brand new, it runs off OS X 10.3 Panther. I set about installing what software I had that worked on a Mac...Flash MX, Dreamweaver MX, Painter Classic all installed perfectly. Then I tried to install a demo version of LightWave 3D 7.5. Now, this is a version of LightWave that came with a book, Essential LightWave 3D 7.5 by Timothy Albee, and the files for the demo were zipped. I used StuffIt to extract them in Applications, and then I tried to open the installer files for the Mac version. They wouldn't work. The icon for the files was a grey box with a green 'exec' or 'exe' in the top left corner, and when I got the info on the files, they had no extension to their name but were referred to as 'Unix Executable Files'. One of them is a readme type file (just text) and it opens fine, but as for the files needed to launch the setup to install the program; it won't open those. I tried opening them using Unix in the Terminal as well, but that wouldn't work either. Any suggestions?