Sorry for the novice question but is anyone able to explain how to extract a .gog file?

From DOS game? I'm not sure, but I think they're .iso files

Can I simply rename the GAME.GOG to GAME.BIN and rename GAME.DAT to GAME.CUE?

They use to be iso files. If renamed accordingly they should be extracted with a valid compressor (winrar etc) or mounted etc...

At least that's what i do.

EDIT: Oh, in case they are bin/cue instead iso, I guess they can be renamed as well and then mounted. It should work.

If it's an ISO image, just rename the ending to .iso and mount the image.

It can also be a bin/cue image. Then you should look for the .ins file. Change the .ins ending to .cue and mount the image. In this case don't rename the .gog file.

i think thats what i did with my gog version of magic carpet when i shoved it on my android phone for use with retroarch. beyond that i have no help to give.

The game in question is the original Tomb Raider.

Normally, just run the game file like it is an executable. Was that the question?

For Tomb Raider just rename the GAME.DAT to GAME.CUE and mount. Don't rename the GAME.GOG (This was wrong)

Edit: Rename the GAME.GOG to GAME.ISO and mount. This is working.

I don't have that particular game, but I've seen both iso and bin/cue. Just try both ways.

EDIT: Or do as Hustlefan suggested.

Thanks. Just for reference is there any reason not to rename GAME.GOG?

I've edited my post again. Now i found the solution. Look above.

If you have a game with a bin/cue image then the .cue file is pointing to the exact filename game.gog

Since the thread was necro'd already, maybe it's interesting to share this:
If you want to use these files in another DOSBox install, some times you can use the .conf file that has instructions to launch the game as an executable in DOSBox (rename it something short with the .bat extension, e.g. launcher.bat). No need to modify any other files, and you don't need to move files around.
You can also keep the original conf file and just create a copy of it and rename as mentioned before (remember it needs to be in the same path as the original .conf file, or you need to fix all paths mentioned in the file).

The only problem is that some games don't boot if you do it, so you need to test which do and which don't. The ones I know that work with this method are The Elder Scrolls Chapter II: Daggerfall, Heretic: Shadow of the Serpent Riders, Wolfenstein 3D: Spear of Destiny and Quake: The Offering.

Edit: Added some missing info.