TIL (because I was using some tools to hack on the files) that Wing Commander 1 lipsyncs the dialogue in the briefing scenes, and it does it by having a second copy of the line that's spoken in the dialogue file, but it's a simplified pseudo-phonetic version:
Text="We've got a lot of work to do, people, so let's get to it."
LipSyncText="wevgotalotofwerktodopepulsolesgettoit"