OK I thought that Mac applications would remain working and executable after I copied them over to my Wintel PC to burn them onto CD-R. I mean, heck they remained working after I copied them over Samba networking to my PC's hard drive! So why the heck do they stop executing after I burn them to CD? By this I mean the Mac apps that have no file extension when viewed under MS Windows -- .dmg and .sit files execute and open just fine after I burn them to CD. But Mac applications refuse to run, and OS X just pops up that "There is no default application specified to open the file blah blah dialog. There are some hidden . files in each directory which I burned to CD along with the apps. So I can't understand what information is missing that is causing the apps to fail to execute. is it because the UNIX executable flag (chmod 755 etc) is not set? If that is the case, why did my apps continue to execute even after I copied them over to my Wintel PC using Samba networking? Bizarre stuff  I've tried copying the apps from the CD-R to my iBook, and then executing it there. Still no luck. Also tried adding a .app extension to the filename, and also chmod-ing the file to make it executable. Still doesn't run! I'm lost here Oh the application icons and all that have also disappeared after I burned them to CD. All file icons appear as just blank documents. Baffling!