I know it is a little late but I have some great news! I have been working for 8 hours straight on this and I have finally figured it out to get subtitles working in Doom 3 on Vista.
For all Vista users who cannot get Doom 3 subtitles to work, here is what you do:
Download WinZip
WinZip - Free software downloads and reviews - CNET Download.com
Download the Doom v1.3 patch and install
d3_1_3.exe Download File
Download Doom [CC] v2.0
Doom 3 Modification (Full Install) DOOM3[CC] Mod v2.0 Download File
As you know in the readme file you see that it says "check use folder names", you do not see that in Winrar, but WinZip. So that is why you need WinZip to extract.
After you have patched Doom 3 to v1.3, extract the [CC] v2.0 into the Doom 3 directory with WinZip and make sure the "use folder names" is checked.
Right click on the Doom 3 application/Shortcut and go to the compatibility tab and run the program in compatibility for Windows XP/ SP 2. Do NOT run as administrator, just double click and let the game run. When you are finally at the main menu, click on the MOD(S) button, then load the Doom[CC] v2.0, and then you are set to have subtitles in your game!
For all Vista users who cannot get Doom 3 subtitles to work, here is what you do:
Download WinZip
WinZip - Free software downloads and reviews - CNET Download.com
Download the Doom v1.3 patch and install
d3_1_3.exe Download File
Download Doom [CC] v2.0
Doom 3 Modification (Full Install) DOOM3[CC] Mod v2.0 Download File
As you know in the readme file you see that it says "check use folder names", you do not see that in Winrar, but WinZip. So that is why you need WinZip to extract.
After you have patched Doom 3 to v1.3, extract the [CC] v2.0 into the Doom 3 directory with WinZip and make sure the "use folder names" is checked.
Right click on the Doom 3 application/Shortcut and go to the compatibility tab and run the program in compatibility for Windows XP/ SP 2. Do NOT run as administrator, just double click and let the game run. When you are finally at the main menu, click on the MOD(S) button, then load the Doom[CC] v2.0, and then you are set to have subtitles in your game!