1.00h is somewhat easy to acquire, or at least it was. The site it could be gained from recently changed their version to 1.00g, as I recall. The versions are essentially the same. I haven't really noticed any differences between them, but I experiment very little with the OEM versions. Any memory editing which could provide useful info often causes the game to crash.

Also, I do have version 1.20. It came free with my copy of TSF, because I preordered it or some such thing. It's basically the same as 1.21, but as I recall, there is no multiplayer except for LAN and splitscreen. 1.20 is basically useless.

Also, I have always said this and forever will: 1.22 was the best version. It's got nearly all the fixes of 1.23, including trigger zones, and it doesn't have the annoying new ugly yellow logo. I believe it is compatible with 1.23 servers as well.

If anyone has questions about a JJ2 version, feel free to pester me. I have them all installed. Just don't expect the reply to be prompt.

Now, to answer the original question of the poster. The retail versions of JJ2 use .j2l level formats. They contain all the same info as the .lev format the OEM version uses, but it is highly compressed in a way that JCS can read it (the compression is actually very impressive). JJ2 is just $5 or so on eBay. Go get it.