Somebody right below you contradicted you , but i am assuming it is like halo 4 liberty where you can be signed online and mod campagain save and it will unlock achievements and not show that you did anything dishonest.
Also when i downloaded it , will not open and says windows is looking for a solution.
I dont see any contardiction TLOR was talking about unlocking while online and the other guy was talking about offline
There being contradicted because the 1st guy says that you can use these mods in single player when connected to xbl and the 2nd guy says you cant.
Ps I figured it out how to open it just had to extract all to my desktop.
Pss: I apolgize for the fact I am such a newb at things like this. Can anyone hear walk me through how to get my save on my computer though xbl or aim. Thanks in advance.
He never said you cant and you can use this while connected to live.
Cool my only question now is does it give you unlimted health and ammo options? Health is the main thing. And is it easy to use like liberty for halo 4?
If you can find a dvar for that then yes your best bet on that is to discuss with other members who have been experimenting with this tool.
What does dvar mean?
Im not to sure how to explain it but basicly data like ammo and jump height ect. are dvars and you can modify them to get lots of ammo and super high jump ect.
All i care about really is unlimited health lol . Anyway I am not getting this game until Christmas 12/25/12 so hopefully someone can help me before then. Seems this tool is a bit more complicated then the Halo 4 save editor to say the least lol.
Just a variable which can be edited to tweak game settings.
To clarify, you can mod while connected to LIVE, but it won’t effect anything outside of singe player campaign.
Okay and if anybody reading this knows how to get infinite life in single player using this tool please pm me = thank u.
i also would like to know this if someone could be so kind as to share that little bit of info
So far, can’t get it to work. Fails to load segment 3 a lot, and if you load a save before you start a mission (at the loadout screen) it doesn’t affect the mission as I’ve seen.
I tweaked a few things an so far no results. When I try to get a game that’s during the mission and it fails to load the dvars.
Dark Soul if you ever do find out please let me know thanks and ill do the same to you if i find out somewhere outsides this post. 
Has anybody at all gotten it to work that you know of?
Thanks to UnHolyness for this info. I have not tested it out as I am not getting the game till Christmas but from the little I know about these forums he is very reputable and this will work according to him if you may the follow edits with the campaign modder.
player_swimDamage 0
player_deathInvulnerableTime 9999
player_damageMultiplier 0
player_radiusDamageMultiplier 0
player_meleeDamageMultiplier 0
bg_fallDamageMaxHeight 9999
bg_fallDamageMinHeight 9998
g_player_maxhealth 2000
player_deathInvulnerableToMelee 1
dog_MeleeDamage 0
fire_world_damage_rate 0
player_deathInvulnerableToProjectile - 1
g_radiusDamageMax - 0
Then the one that says Player_sustainammo 0 change the 0 to 1
Put the numbers that are listed next to the DVARS that will make you invincible and the Sustain ammo gives you unlimited ammo
Unholyness = Best Guy Around!!! 
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So far none of them are confirmed working.
Not sure he said it worked for him.
I’ll have to try it out right now, but last time I checked it wouldn’t work.