1 person found this helpful
I think that not all the Photoshop functions work in 64bit mode and that is why you need the second, 32bit version :-/
But I am not sure if I am right
I agree with both Replies. PS 64-bit will not work with many, 32-bit only plug-ins, and there are some other changes with PS 64-bit. Per John T's comment, this forum: http://forums.adobe.com/community/photoshop/general will be the best place to post, as the users there can tell you ALL of the differences, such as supported scanners, and much more.
Good luck, and if you have many 3rd party plug-ins, or a 32-bit only scanner, etc., having both versions available, if you are not limited on HDD space, is a good way to handle things, IMHO.