I already asked this but got no response - so - I'll try again.:

I am having a problem with tiff files not opening when I double click on them (could not complete your request because of a program error) but when I use File/Open, they open without an error. This just started after installing a new iMac 2.33 Core 2 Duo running 10.4.8 and loading Photoshop CS2 on it (the same version I was using on a G4 with 10.3.9).