Let me start by clarifying something: I a talking about Hammer 4.x not 3.x, there is a huge difference, 3.x is for GoldSrc games like Half-life or COunter-Strike, or Team Fortress Classic. 4.x is for source games like HL2 or CSS. The way I see it what keeps 4.x from working properly, (crashes on opening a map) like 3.x is the fact that Goldsrc, being at least partly based on the quake engine can be run in OpenGL mode, whereas Source cannot. I've been told that the 3D view in Hammer is what's causing it to crash, I don't know how to disable it and without 3D view map making would be almost impossible as there would be no way to see what the map actually looks like. I've added these registry entries: (HKEY_CURRENT_USER\Software\Wine\Direct3D): OffscreenRenderingMode=fbo VideoMemorySize=512 DirectDrawRenderer=fbo UseGLSL=enable RenderTargetLockMode=auto Multisampling=enabled PixelShaderMode=enabled But they don't seem to make any difference. I've also ran it in lower directx levels, namely 7.x, but to no avail. Any ideas?