Strange, vanilla game supposed to enable subtitles by default. You just need to place Subtitles.int into System folder. Are you sure you redownloaded the file? It need to have [SubtitlesText] in the beginning, with square brackets.

It is the correct .int file. Have also tried with Direct3D and widescreenpatch. Unfortunately no subtitle text appears on the intro.

I'll try to install fresh version of Undying and check. Maybe its an option in Renewal mod

You also need to place this file in the sounds folder: https://ufile.io/w1qduyza
If someone could reupload it somewhere permanent, that would be great.

If its works - say it

Will try right away when I get home ;-)

I can confirm that the subtitles work if you also copy the modified "Voiceover.uax" in the Sounds folder.
Without it, the subtitles won't show up (tested with vanilla installation, with Direct3d driver, all settings on high).

There already is a Voiceover.uax file in the Sounds folder. It seems that it could be patched to become the modified ""Voiceover.uax" that works for subtitles, without the need to distribute the full modded file.

My guess is that all sounds have a flag if they have subtitles or not, so patching all sounds in .uax file wouldn't be simple.
I also tried patching Engine.dll to ignore subtitles flag and it works. Unfortunately the game crashes when loading levels/save game.

I was mostly talking about "blindly" creating a patch, given that the uploaded "Voiceover.uax" file works, from the diff (or some more clever algorithm) of the two files (original and modded). So, I'm probably using old tools for this job, but NSIS3 has, for example, the genpat utility that will create a binary patch, which then can be made to be installed via a NSIS script/executable installer. From a quick test this patch comes to about 25KB size.

But you're right. If someone were to fully recreate the process of setting all the voice sounds to have subtitles, from scratch, to make sure that everything is as they want it, then I wouldn't I expect that to be simple at all.

Ok. with the uax it worked. This seems to be edited in the header. The wave files in it are all the same. I made a diff patch on the fly with xDelta- works.

https://www.mediafire.com/file/n17uo0bjmo6kjps/Voiceoveruax.xdelta/file

So you could make a patch with the edited voiceover.uax and the subtitle.int, or patch the uax file while patching with xDelta. This would make the patch much smaller. xDelta patch 15kb + subtitles.int 41kb.

EDIT:

Here is the patch. Unfortunately it is still 27MB in size. I could patch the file with xdelta in the main directory (when I copied the voiceover there), but not in the sound directory. I hope I can fix this and make the patch smaller ;-)

https://www.mediafire.com/file/sia19ghxim63yzp/Clive+Barkers+Undying+Subtitle+Patch.rar/file

Is there is a way to insert those prerequisite properties into other uax files? There are few lines of subtitles not only in voiceover.uax.

Here's LevelMechanics.uax with subtitles enabled: https://ufile.io/dhx3o71a

The subtitle patch is nice, thanks for that, but there are still few missing words and other errors. Would some native English speaker go through it and correct them, please?

Yes, is there some list of remaining issues? Will all subtitles be in the game after inclusion of LocalMechanics.uax? When I open subtitles.int file, some texts are duplictaced (like Kie_009 and Kie_009a). Is that correct? Also some inaudible words can be filled in and others are meant to be inaudible, right?