sorry, just to mention also that this file did originally open okay with the "rasterize generic EPS format" box giving the option to change the size etc. it just won't open with that box now.rasterize generic EPS format box and opens straight away to a set size.
Encapsulated PostScript-files can contain either vector-content (in which case one gets prompted when opening with Photoshop), pixel-content (in which case Photoshop opens straight away) or a mixture (same as the first case).
When a file has been rasterized that’s that, You may want to go back to the original file if You can locate it.
Edit: Sorry, I read Your original post carelessly …
Have You tried opening the original file in Illustrator yet?
thanks for the info. i've managed to find the original file i was sent and opened it again from that & it seemed to work, giving me the option to resize.
i've not got illustrator though, just using photoshop.