I am not aware of any documentation for this, but take a look at the getStrings function in the ScummVM source code (in file engines/scumm/smush/smush_player.cpp), which is responsible for parsing digtxt.trs. In particular, it seems that the content is "encrypted" by XORing with 0xCC. Yes...

Hi, I'm localizing The Dig, and I suppose the cutscene subtitles are contained by the video/digtxt.trs file. But neither ScummEx nor ScummRev can decode/encode its contents, the mysterious (no documentation found using Google) ETRS chunk. Could anyone provide a format specification or a software tha...