COULD NOT COMPLETE YOUR REQUEST BECAUSE THERE IS NOT ENOUGH MEMORY (RAM)

That message comes up as I try to open 3DS files … any hints ? thanks
(adobe photoshop cs4)

have you set your scratch disks correctly - assuming you have more than one hard drive on your system, which you really do need for photoshop to work well with large files/tasks, you should set your scratch disk[s] up to a separate physical disk from the one your system/photoshop is on and it should ideally be used for nothing else in order to ensure plenty of free contiguous space

no guarantees just something to check in preferences

[if you have scratch disks set then photoshop can offload from RAM to these, using them for its own private memory paging file[s]]

Hint: http://en.wikipedia.org/wiki/.3ds