That's because there isn't one...
I would suggest giving them the download exe that you used to download the RTP. I assume you still have the installation files (I always keep mine should something go wrong)? If so, there is one that says RM2003_RTP (or something like that...). That is the RTP downloader. If you give your friends that file, it'll download the RTP for them (obviously) and they can play the game!
Also, I think that there might be a translator in there somewhere for 2k3... (NVM... There isn't)
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Wow... looking at that post, I think I sound like a douchebag...