1.Why there's some different version of original Lemmings under Dos? Here's the thing I mean with "version":
1. First level music reappears on other levels when there's a failure
2. Cheat code and Version number code don't work
Are you sure they are "official" versions, as opposed to cracked versions?
3. Falling from too high height isn't the same
Wow, a DOS version that does this?
That's a new.
Are you sure about this? I guess "We All Fall Down" would be the litmus test.
Again, if it's a DOS version where you don't have to do anything to solve "We All Fall Down", I'm inclined to say your copy is a cracked copy that changes more than the copy protection......
2. Was Customized Lemmings release on a CD? And why the CD tracks play in this order while playing the game: 9 - 10 - 11 - 13 - 14 - 7? Do you know?
I doubt it. Customized lemmings is a hacked version of the EXE from ONML I believe. I very much doubt it was ever released in any format except as a download--it would take money and time to make and distribute CDs and you can't legally charge anyone for the program, so it just won't be worth anyone's time to do release it on a CD. I have no idea about the CD track orders--but it's possible (though completely speculative) that the hacker might have hacked in music-playing code from some other game that happens to have this CD track order. (I seem to recall the L2 Tribes demo has a long, technical readme about CD playback, I wonder if custlemm ripped code from the L2 demo?)
In short, I highly doubt that Mike would know anything about the CustLemm question, and perhaps not much about the first question either. Remember, he didn't even know about LemEdit until I mentioned it to him when he was talking about his Amiga floppy with DMA's official level editor.