Hi Ladimir,
Welcome to the team.
Oops, looks like Owen beat me to it. Ya sorry only 2004 & up.
Also, thank you JB for the detailed replay.
However Ladimir, you don't need to download both the Studio & the Runtime. To get started just download the Studio, it will install the runtime at the same time.
Once you get to know OpenDCL better & you start pushing your app's out to others, then you can give them the runtime also.
The multiple links in the Studio are for the different language versions:
English (ENU), German (DEU), Chinese (CHS), Spanish (ESM), & French (FRA)
If you can make it to AU2008 this year I'll be teaching a class on OpenDCL designed for new users like yourself.