Getting UVMAP from Sculpt Version

Hi,

I know how use Blender for get baked maps (like Ambient Occlusion) and is the only map I can get now, but if I need to get the diffuse map again from a sculpted model, what I do ?

When I use Sculptris, it delete my original UVMAP and create a new map…
http://img713.imageshack.us/img713/9711/omberiano.png

But Blender keep the original uvmap, but how I unwrap again the map (using edit -> unwrap dont work with model sculpt). I get only the baked map from Ambient Occlusion, see:
http://img836.imageshack.us/img836/8850/omberianoblender1.png

http://img816.imageshack.us/img816/6789/omberianoblender2.pnghttp://img153.imageshack.us/img153/1510/omberianoblender0.png