Killing Floor PC Tech Specs: Ports, APIs, DLC and Community Fixes

PCGamingWiki keeps one of the most detailed technical records of Killing Floor 1. Our older PC Gaming Wiki fixes page covers the common problem/solution list; this page is the reference sheet: what the PC version actually supports, where its files live on each OS, which ports and APIs it uses, what DLC and cross-game unlocks exist, and the less-known community fixes.

Killing Floor cover art as used on PCGamingWiki.

Platforms and release

Item	Details
Developer	Tripwire Interactive
macOS and Linux ports	Ryan C. Gordon
Publisher	Tripwire Interactive
Engine	Unreal Engine 2.5
Windows release	14 May 2009
macOS release	5 May 2010
Linux release	9 November 2012
Metacritic	72
DRM	Steam on every store version

The original KFMod (2005) was a total conversion for Unreal Tournament 2004 and is still available on ModDB; it needs UT2004 to run. Retail copies were sold through Steam, Humble Store, GamersGate, Gamesplanet and Green Man Gaming (the Complete Pack was also offered). Every version requires Steam.

macOS warning: the Mac build is 32-bit only, so it does not run on macOS Catalina (10.15) or later.

Monetization, DLC and cross-game unlocks

The base game is a one-time purchase with no microtransactions. Paid DLC adds characters, weapons and weapon skins. All of the following packs are bundled in Killing Floor 1 Complete Your Set! on Steam:

Weapon packs	Character packs
Community Weapon Pack	Ash Harding
Community Weapon Pack 2	Harold Lott
Community Weapons Pack 3 - Us Versus Them Total Conflict	"London's Finest"
Camo Weapon Pack	Mrs Foster
Golden Weapons Pack	Neon
Golden Weapon Pack 2	Nightfall
Neon Weapon Pack	Outbreak
	PostMortem
	Reggie the Rocker
	Robot Special
	Steampunk
	Steampunk 2
	The Chickenator
	Urban Nightmare

Cross-game bonuses from other Tripwire-related games:

• Dwarfs!?: the Dwarfs!? Axe for the Berserker. It used to unlock through an achievement in the free-to-play Dwarfs!?, but that no longer works after a change to Steam privacy settings.
• The Ball: pre-ordering unlocked the character Harchier Spebbington.
• Red Orchestra 2 Digital Deluxe: unlocks the characters George and Nikolay.
• Rising Storm Digital Deluxe: unlocks the Commando's Rising Storm Tommy Gun and the characters Hayato Tanaka and Ricky Vegas.

More on DLC: DLC content overview and golden weapons.

Essential tweaks

Skip the intro videos. Close the game, open <game>\System\KillingFloor.ini, find LocalMap=KFIntro.rom near the top and change it to LocalMap=KF-Menu.rom. The main menu may look slightly broken afterwards but works normally.

Skip the Killing Floor 2 trailers. Delete the Movies folder in the game directory.

Game data and config locations

In-game General settings.

System	Config location
Windows / Steam	<path-to-game>\System\*.ini
macOS	$HOME/Library/Application Support/Killing Floor/
Linux	$HOME/.killingfloor/

• KillingFloor.ini stores audio, general, network and video settings.
• User.ini stores key bindings, FOV and HUD settings.
• The game manual is in <path-to-game>\Help.
• Saves live in Steam Cloud (about 954 MB available), so they are not reachable as local files.
• On Linux the game ignores the XDG Base Directory specification.

Full path reference: KF ini file location.

In-game HUD settings.

Video

In-game Video settings.

Feature	Support and notes
Widescreen	Yes
Multi-monitor	Via ini edit (see below)
Ultra-widescreen	Proper Hor+ scaling, but ultrawide resolutions are not listed in game; set them in the ini
4K	No: maximum vertical resolution is 1600p
Field of view	Default 106.3 degrees horizontal; fov <number> in console, resets on every map load
Windowed	Yes; starting in windowed mode can make the main menu unreadable
Borderless window	Not native; use the Borderless Gaming tool
Anisotropic filtering	Yes
Anti-aliasing	Up to 8x MSAA; Nvidia can force SGSSAA with flag 0x000000C1 in Nvidia Profile Inspector (DX9 renderer only)
V-sync	Yes; Direct3D 8 mode on Windows 10+ needs a display wrapper for v-sync to work
High frame rate	Capped by default, see below
HDR, color-blind mode	Not documented; no known in-game option

Unlock the frame rate: in KillingFloor.ini change MaxClientFrameRate=90 to MaxClientFrameRate=200, launch the game, open the console with ~ and type netspeed 20000. The frame rate is then unlocked in multiplayer. Deeper tuning: advanced FPS config.

Multi-monitor / custom resolutions: edit FullscreenViewportX and FullscreenViewportY in KillingFloor.ini, for example 5760 and 1080 for triple 1080p.

Borderless window: install Borderless Gaming, add Killing Floor to its favorites, right-click the entry and disable Auto-Maximize, then set your resolution in game and turn off Full Screen.

Input

In-game Controls settings.

In-game key remapping.

• Keyboard and mouse: key remapping, mouse acceleration setting, mouse Y-axis inversion and mouse navigation in menus are supported natively.
• Controllers are supported in game, but not across all menus (no full controller support). Controller remapping and Y-axis inversion must be done in User.ini. Known bug: joystick input is ignored while fire is held until you press another button or move the mouse.
• Toggle walk: bind it from the console with set input X Toggle bRun (replace X with the key), or edit the binding in User.ini.

Binding ideas: useful binds and keybinds.

Audio and languages

In-game Audio settings.

• Separate volume sliders for effects, music and voice chat.
• Surround sound configures itself up to 7.0.
• If an onboard Realtek card plays 5.1 through only two speakers: set 5.1 both in Windows sound settings and in the Realtek manager (Control Panel - Sound), and set the manager's environment to "Generic" or "Room" (a fix from the Windows 7 5.1 sound thread on the killingfloor.ru forum).
• EAX 3 support.
• No subtitles, no closed captions, no mute when the window loses focus.

Language	Interface	Voice
English, French, German, Italian, Russian, Spanish	Yes	Yes
Hungarian, Polish	Yes	No
Czech	Fan translation	No

Russian players can also check Russian localization fonts.

Network

Type	Players	Notes
Local (split screen)	-	Not native; possible with Nucleus Co-op
LAN	6	Co-op
Online	6	Co-op; can be raised externally with mods

• Connection types: peer-to-peer (listen server), dedicated servers and self-hosting; no matchmaking.
• Direct IP: open the console with ~ and type open followed by IP and port.
• When hosting a listen server behind a router you may need to change ServerBehindNAT=False to True in KillingFloor.ini.
• UPnP support is unknown.

Protocol	Ports
TCP	8075, 28852
UDP	7707, 7708, 7717, 20560, 28852

Server hosting walkthroughs: KF1 Linux server with SteamCMD and ports and NAT.

VR

No native VR. vorpX has a user-made profile using its G3D mode. The Novint Falcon haptic controller is listed as supported.

Community fixes and known issues

Mutator fixes worth installing:

• CustomSpawnFix: fixes ZED spawning on older maps (also on the Workshop).
• Grenade Arm Fix: shows your character's real arms when throwing a grenade instead of generic camo arms.
• Paramedic Alfred Anderson Viewmodel Fix: gives Alfred Anderson his intended rolled-up sleeves in first person.
• Unicode Fix: non-English characters show properly in chat instead of ~~~~~~~.

Mouse sensitivity keeps resetting. Either change the sensitivity in the menu right after launching and before joining a server, or close the game, open <game>\System\User.ini and set MouseSensitivity= under [Engine.PlayerInput]. More: mouse sensitivity not saving.

Crash to desktop. In the compatibility properties of Killing Floor.exe, disable visual themes and desktop composition.

Flickering. Add -windowed to the Steam launch options, then maximize the window after the game starts. Flicker can also be caused by running a non-native resolution.

No online games / 0 servers. Exit Steam, delete ClientRegistry.blob from the Steam folder (C:\Program Files (x86)\Steam), then restart Steam and the game. See also master server list empty.

Re-enable gore. Some versions ship with gore disabled. Run the game once, open <game>\System\KillingFloor.ini, find [Engine.Engine] and add bdevgoreoverride=True as the last line of that block. Save and restart Steam.

Main menu unreadable in windowed mode. Switch to fullscreen.

Sound stuttering on Arch Linux. Back up openal.so in <game>/System, install lib32-openal (or openal on a 32-bit system) and symlink it:

ln -s /usr/lib32/libopenal.so.1 <path-to-game>/System/openal.so

On 32-bit systems use /usr/lib/libopenal.so.1 instead. Other Linux notes: Killing Floor on Linux.

API and middleware

Item	Details
Direct3D	8, 9
OpenGL	2.1
Windows executable	32-bit only; may need the Large Address Aware flag on modern systems
macOS and Linux executables	32-bit only
Physics	Karma
Audio	Miles Sound System, OpenAL, Speex
Cutscenes	Bink Video
Multiplayer	Steamworks

The LAA flag fix is described in Large Address Aware crash fix. For console commands see the console commands list.

System requirements

	Windows minimum	Windows recommended
OS	XP, Vista	XP, Vista
CPU	1.2 GHz	2.4 GHz
RAM	1 GB	2 GB
Storage	2 GB	2 GB
GPU	64 MB VRAM, DirectX 9 compatible	128 MB VRAM, Shader Model 2.0
Sound	DirectX 8.1 compatible	EAX compatible

	macOS minimum
OS	10.5.8, 10.6.3
CPU	Intel
Storage	2 GB
GPU	Nvidia or ATI (Intel GPUs unsupported)

	Linux minimum	Linux recommended
OS	Ubuntu 12.04 LTS	Ubuntu 12.04 LTS
CPU	1.2 GHz	2.4 GHz
RAM	1 GB	2 GB
Storage	2 GB	2 GB
GPU	Nvidia, ATI or Intel	Nvidia, ATI or Intel