[No One Lives Forever midi music.. anyone have it?]

I could find .ogg versions of that but no .mid files.  I tried to convert the oggs to mids but they didn't sound right coming out the other end.  But just in case you can use the janky version that I converted it's attached to this post.

NOLF Soundtrack Badedum - Intensity 04 normal.ogg.mid

[After mission bonuses question]

Thanks for the details on the bonuses!  I had a hard time trying to find any information on how that all worked and to what effect.  Overall, I didn't think the bonuses were game changers while playing the game, but then again I never played on the hardest difficulty.  Also, after completing both NOLF 1 and 2 I went back to read about the bonuses and secrets to see what I missed.  I was kind of surprised that they made the game in such a way where you would need to acquire an item and then go back to previous levels to find more secret areas.  I think acquiring the earplugs from NOLF 1 is a good example of that.  Again, thanks for the clarifications!

[Client MFC crash theory]

Just my two cents worth here as I had the same issues with the Siberia levels.  So many crashes and nothing seemed to help except to save often.  Well, okay one thing that did help was the loading crash patch (as seen in the above post) but not much else.  Even the set the lithtech.exe to one CPU core trick didn't work for me.  But once I got passed the Siberia levels, I didn't have a single crash.  So what ever is causing the crashes is definitely part of the makeup of those Siberia levels.

[After mission bonuses question]

Oh, and one more thing I found related to this question is regarding the reputation bonus:

Similarly, a Reputation Bonus stat would be granted through the game when the player acted nice in conversations, but the stat never amounted to anything obvious. “It was supposed to effect how certain conversations would play out,” explained Hubbard. “it was a partially implemented feature that neither got finished or removed.”

Source: No One Lives Forever’s cutting room floor revealed

 

[After mission bonuses question]

I'm doing a recent play through and I also had this question.  The only thing I could find on the topic was from Wikipedia of all places:

"At the end of each mission, the game displays various statistics, as well as any awards and bonuses earned during the mission. Awards are humorous textual notes given for the player's performance during a mission; these include awards for using a very low or a very high number of bullets, or a "Thanks For Not Getting Hurt Award" for avoiding damage. The player also receives a rank, such as "Trainee" or "Super Spy", which is based on the number of intelligence items obtained during the mission. Achieving a high mission rank increases the player's maximum health, armor and ammo capacity, as well as stealth, the amount of inflicted damage, and the accuracy of their shots."

So it seems that those bonuses do make a difference, but I can't find anywhere that quantifies what those bonuses are.  Hope this helps!