You've posted in the forum for Adobe Photoshop Sketch, which is a mobile app unrelated to your problem.
Please clarify what software you're using and we can move this post into the right place. You said "Photoshop 8.0" which could mean:
Adobe Photoshop CS, released in 2003, internally referenced as Photoshop 8.0.
Adobe Photoshop Elements 8, released in 2009.
Please clarify and we'll move this post.
Note: it may also help if you tell us your version of Mac OS.
Adobe Photoshop CS, released in 2003, internally referenced as Photoshop 8.0. Thanks.
[irrelevant links removed-kglad]
Moved to the Photoshop forum. It may help to know your OS version as well.
What file types are they?
Do the files open in Preview or ImageReady?