Lightmaps

I was looking for a technic to creating lights/shadows map in bitmaps in order to be used in another program who can use them in multitextring, but can't create them.
(I have been trying to do it using 3ds then importing objects in quake's3 exporter then using a plug-in that supposably create the lightmaps from there, but i'm not really fond of quake's editor so far lol so if anyone knows another way...)

[glow=red,2,300]Ideas anyone ?[/glow]