Recently I spent some time figuring out how to run Heroes of Might and Magic (as distributed by GOG) on Linux.

Turns out that the file `homm1.gog` is a CD-ROM image that you can mount from within DOSBox with `imgmount d homm1.gog -t iso`. Maybe I'm missing something, but that wasn't obvious!

I put together a quick guide at https://blog.pablobm.com/2023/04/18/unable-to-access-cd-drive-on-dosbox.html, for future me and for others who may be equally confused.