Original The Total Annihilation Commander Pack includes a Exclusive Strategy Guide (source: http://web.archive.org/web/20000520070943/http://www.cavedog.com/totala/tacp.html): 288-page strategy guide from expert gamer Selby Bateman and GW Press. The guide includes a mission-by-mission walkthrough of the original game as well as extensive multiplayer and single-player strategies. Does GOG version of Commander Pack have it?

Nope.

Wish it'd came with one, the closest to a proper walkthrough I've found is on StrategyWiki