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Step 1: Run GCFScape (it will require that Steam not be running, so open the Task Manager and end Steam.exe.)
Step 2: Click 'Open' and find the folder C:\Program Files\Steam\Steamapps\, in it will be various .GCF files. open the one that you need. For example, all CS:S models/textures are in Counter-Strike Source Shared.GCF and all HL2 models are in Source Model.GCF.
Step 3: Find the files of the model you want. For example, all CS:S weapon models are in cstrike\models\weapons\. All models have 5 total files each, a .dx80.vtx, .dx90.vtx, .mdl, .sw.vtx, and a .vvd. You need all of them, so select them all and right-click->Extract them to a folder.
Step 4: Now run MDL Decompiler, which requires that Steam is running. Uncheck all of the boxes at the bottom of the window and browse for the .MDL file of the model, making sure that all 5 files are in the same folder, and them choose the output folder that the model will be decompiled to. Now let it do it's thing.
Step 5: Now boot up 3DSMax8. Note: 9 will not work. Go to File->Import... and select Half-Life 2 SMD from the File Type drop-down box, then find the folder of the decompiled model. In it, there should be numerous files. The one that you want to import will be called something like reference.smd, [MODEL].smd, or something else. What you don't want to import is a lower level-of-detail model, which will have lod2, lod3, etc. in their filename.
Step 6: If you'd like to put a custom texture on the model, open the Material Editor with 'm' and click the small button labeled '1' in the screenshot, then choose 'bitmap' from the window that pops up and find the texture. If you installed the .VTF plug-in, you can also use .VTF textures. Once it's loaded, either drag-and-drop the sphere that represents the texture onto the model or select the model and click the button labeled '2' in the screenshot. Now press the button labeled '3' and viola!
That concludes this tutorial, if you have any questions please ask and if you find any errors, please point them out so I may correct them.