MDLDecompiler
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MDLDecompiler is a tool written by Cannonfodder for decompiling Source models back into they're component parts; namely SMD, VTA and QC files.
MDLDecompiler only works with version 44 MDL files from the orignal HL2 or Episode 1 and cannot decompiled newer Orangebox models which are version 48. A work around for this is to edit the MDL in a HEX editor (such as PSPad) and change the 5th byte from hex 0x30 to 0x2C or, in ASCII, from a "0" (zero) to "," (comma). If the 5th byte is a "." change it to a comma anyway, it still works!
Some issues with the original Cannonfodder decompiler were fixed by Erix920 but some bugs still remain.
Note:MDLDecompiler is not 100% reliable and has some issues with certain MDL files. It also doesn't produce a "perfect" decompile and you may need to rework the QC file to be able to recompile a model properly.External links
You can download working versions of the tools from the links below.