The CD version, for some reason, also has a slight increase in the fall distance, which makes the "We all fall down" level way too easy. The author of http://faqs.ign.com/articles/369/369161p1.html" class="bbc_link" target="_blank">this walkthrough mentions the difference.

Your packs are missing track 18; they have a duplicate of track 17 instead.

Well, that's embarassing. I'll re-rip the missing track and re-upload the packs. EDIT: The new packs are uploaded now!

This CD was a mixed data/audio CD. The data portion contained Lemmings and Oh No! More Lemmings (it didn't need to be installed; even if it was, you had to have the CD in.) The audio is used for the levels. I could never get the audio working when I was younger, playing it on Windows 95 and 98, but it works with DOSBox perfectly.

EDIT: I found a folder named DOXVIEW on the disc, which contained a copy of the instruction manual. The DOX file was mostly plain-text but contained references to some PCX images. I manually converted it to HTML/PNG and you can read it here: http://www.lakora.us/lemmings/dox/" class="bbc_link" target="_blank">http://www.lakora.us/lemmings/dox/

Also, here's what the disc looks like, in case you're curious. The silver part actually isn't colored at all - just the same color as the disc itself.
http://i.imgur.com/tLPHb.jpg" class="bbc_link" target="_blank">http://i.imgur.com/tLPHbs.jpg" alt="" class="bbc_img" />

Updated July 7, 2012

Here are the tracks from the version of Lemmings / Oh No More Lemmings that came on a CD-ROM and used CD audio. I uploaded both MP3 and raw WAV versions. Download the MP3s unless you need WAVs (MP3 files are much smaller.) If you want it in Ogg Vorbis or something like that, let me know.

http://www.mediafire.com/?wnerid8pqccdkld" class="bbc_link" target="_blank">MP3: All Tracks (29.6 MB)

http://www.mediafire.com/?7bnepgshe1ncjqd" class="bbc_link" target="_blank">WAV: Tracks 2-13 (136 MB)
http://www.mediafire.com/?3xga384sq2033wa" class="bbc_link" target="_blank">WAV: Tracks 14-24 (134 MB)

These tracks are made from a bin/toc backup I made from the original disc today with cdrdao (paranoia mode = 1) using a better CD drive than my last backup. I used bchunk to extract the WAV files from that backup. Some of the tracks may have a couple of clicks in them, but it's not that bad.
Also, track 10 had a split-second gap in it; I made a separate file where I filled in that gap (by copying samples 712839-721626 to 1022139-1030926).