That provided archive is from 2005 and unfortunately doesn't contain a readme.
That's why I'll give a short description.
INSTALLATION
- Copy DXMTLDummy.u and MTLExtender.exe in the system folder of DeusEx
- Add DXMTLDummy to the list of EditPackages (in DeusEx.ini) ABOVE your own mod
- Compile your mod with UCC
- Execute MTLExtender.exe
- The program will ask for the desired file to be MTL extended; specify your mod with extension (e.g. SG_MOD152.u)
- After pressing ENTER the program will automatically change the binding from DXMTLDummy to DXMTL152b1
If you compile your mod using a batch processing file, you can also specify your mod as first commandline parameter to the MTLExtender.
e.g. MTLExtender.exe SG_MOD152.u
That's all I can remember so far.