COVOXED, I "specialize" on this a little bit 😀
I have a TON of DOSBox packed games from GOG and enjoy getting them to run on a real DOS games. There are maybe 5 or 5 different situations you encounter. The process ranges from easy to a little bit complex, depending on the game.
I've documented all my findings here: http://www.philscomputerlab.com/playing-dosbo … -gaming-pc.html
A lot of games you just copy the game folder and run it on the DOS machine. Other easy games come with a full ISO or BIN/CUE image from an original installation CD. These are my favorite releases.
Harder games come with BIN/CUE images, but have the audio files compressed. So you need to undo that.
The worst are games that use BIN/CUE images, have compressed audio files, but do not contain the original installation CD. Here you need to re-create the CD, but also copy files onto your DOS machine. You sometimes also need to edit various configuration files.
But, so far, I have not run into a DOSBox game that did not run on a real DOS PC. If the release is not idea, I sometimes buy the game on eBay, especially Sold Out Software titles.
Careful, a lot of games use ScummVM instead of DOSBox.