Start with the -console command line parameter. Press ~ during game play to display the console window, then activate the following cheats by entering the corresponding codes. Note: The quotation marks are part of the code:

CHEAT FUNCTION - CHEAT CODE
Silent movement - Cheat "silence"
Disguised to the enemy - Cheat "camouflage"
Guards cannot see you - Cheat "invisible"
Disable AI - Cheat "disable ai"
God mode - setv cl_superman 1
Unlimited ammunition - setv c_noammo 1
Level select - OpenLevels
Save game - PL_SavePos
Load game - PL_RestorePos
Spawn indicated item - L_CreateItem <item name>

Use the following entries with the L_CreateItem code:

ITEM - CHEAT CODE
Binoculars - Equipment.Binocular
Custom - Equipment.Custom
Foto - Equipment.Foto
Lockpicks - Equipment.Lockpick
Medikit - Equipment.Medikit
Bakal - Equipment.Throw:Bakal
Gkluch - Equipment.Throw:GKluch
Grafin - Equipment.Throw:Grafin
Knife - Equipment.Throw:Knife
Korchik - Equipment.Throw:Korchik
Krujka - Equipment.Throw:Krujka
Krujka 1 - Equipment.Throw:Krujka2
Loljka - Equipment.Throw:Lojka1
Loljka 2 - Equipment.Throw:Lojka2
Loljka 3 - Equipment.Throw:Lojka3
Lojka 4 - Equipment.Throw:Lojka4
Molotov Cocktail - Equipment.Throw:Molotok
Otvertka - Equipment.Throw:Otvertka
Out of Order sign - Equipment.Throw:OutofOrder
Papers - Equipment.Throw:Papers
Sovok - Equipment.Throw:Sovok
Stakan - Equipment.Throw:Stakan
Tarelka - Equipment.Throw:Tarelka
Tarelka 2 - Equipment.Throw:Tarelka2
Tarelka 3 - Equipment.Throw:Tarelka3
Tarelka 4 - Equipment.Throw:Tarelka4
Tarelka 5 - Equipment.Throw:Tarelka5
Tarelka 6 - Equipment.Throw:Tarelka6
Tarelka 7 - Equipment.Throw:Tarelka7
Vodka Bottle - Equipment.Throw:VBottle
Vilka - Equipment.Throw:Vilka
American officer gear - Equipment.Wear:AmericanOfficer
British cook gear - Equipment.Wear:BritishCook
British soldier gear - Equipment.Wear:BritishSoldier
Embassy agent gear - Equipment.Wear:EmbassyAgent_1
Embassy agent gear 2 - Equipment.Wear:EmbassyAgent_2
Embassy outfit - Equipment.Wear:EmbassyMan
Embassy soldier outfit - Equipment.Wear:EmbassyManSoldier
Nazi cook gear - Equipment.Wear:GermanCook
German doctor gear - Equipment.Wear:GermanDoctor
German grey gear - Equipment.Wear:GermanGrey
Nazi officer gear 2 - Equipment.Wear:GermanOfficer
Nazi officer gear - Equipment.Wear:GermanSoldier
Nazi officer winter gear - Equipment.Wear:GermanWinterOfficer
Nazi winter gear - Equipment.Wear:GermanWinterSoldier
Nazi winter gear 2 - Equipment.Wear:GermanWinterSoldier2
German yellow outfit - Equipment.Wear:GermanYellow
Hotel guard gear - Equipment.Wear:HotelGuard
Hotel patron gear - Equipment.Wear:HotelMan01
Hotel manager gear - Equipment.Wear:HotelManager
Hotel waiter gear - Equipment.Wear:HotelWaiter
Jacket - Equipment.Wear:Jacket
Standard gear - Equipment.Wear:Player
Posilka elder gear - Equipment.Wear:PosilkaElder
Rasplata gear - Equipment.Wear:RasplataDed
Scientist gear - Equipment.Wear:Scientist
Soviet gear - Equipment.Wear:Soviet
Soviet officer gear - Equipment.Wear:SovietOfficer
Soviet soldier gear - Equipment.Wear:SovietSoldier
Suit - Equipment.Wear:Suitman
Summer gear - Equipment.Wear:Summer
Winter gear - Equipment.Wear:Winter
Wirecutters - Equipment.Wirecut
Chloroform - weapon.Chloroform
Colt - weapon.Colt
DeLisle - weapon.DeLisle
Dynamite - weapon.Dynamite
Enfield - weapon.Enfield
Enfield Sniper rifle - weapon.EnfieldSniper
F1 grenade - weapon.F1
Fiber wire - weapon.FiberWire
Garand - weapon.Garand
Stick grenade - weapon.GermanStick
Gewehr - weapon.Gewehr
K98 - weapon.K98
K98 Sniper Rifle - weapon.K98Sniper
Knife - weapon.Knife
Luger - weapon.Luger
M1903 - weapon.M1903
M1903 sniper rifle - weapon.M1903Sniper
M1 carbine - weapon.M1Carbine
Mosin - weapon.Mosin
Mosin camo - weapon.MosinCamo
Mosin silencer - weapon.MosinSilencer
Mosin sniper - weapon.MosinSniper
MP40 - weapon.Mp40
Nagan - weapon.Nagan
Nagan silencer - weapon.NaganSilencer
PMD6 - weapon.Pmd6
PMK40 - weapon.Pmk40
PPS - weapon.Pps
PPSH - weapon.Ppsh
RGD33 grenade - weapon.Rgd33
Smoke grenade - weapon.Smoke
Sten - weapon.Sten
Sten silencer - weapon.StenSilencer
SVT - weapon.Svt
Svt. sniper - weapon.SvtSniper
Thompson - weapon.Thompson
TT - weapon.TT
Walter pistol - weapon.Walter
? - container.Meshok
? - container.PlayerSack
? - container.Rukzak
? - container.RukzakWinter
? - WeaponMagazine.Colt
? - WeaponMagazine.DeLisle
? - WeaponMagazine.Enfield
? - WeaponMagazine.Garand
? - WeaponMagazine.Gewehr
? - WeaponMagazine.K98
? - WeaponMagazine.Luger
? - WeaponMagazine.M1903
? - WeaponMagazine.M1Carbine
? - WeaponMagazine.Mosin
? - WeaponMagazine.Mp40
? - WeaponMagazine.Nagan
? - WeaponMagazine.Pps
? - WeaponMagazine.Ppsh
? - WeaponMagazine.Sten
? - WeaponMagazine.SVT40
? - WeaponMagazine.Thompson
? - WeaponMagazine.TT
? - WeaponMagazine.Walte