My new tiny tool available here http://www.shdon.com/tools#fsubst

Being a bit obsessed about the perfect retro game experience (isn't everybody here?), I like to run my old games through DOSBox with various different configurations. What can I say? Sometimes I like to hear Space Quest 3 with AdLib sound, sometimes in glorious MT-32 and occasionally, I like to giggle at the PC speaker bleeps.

To prevent having to run the configuration program each time and to be able to use this on a read-only medium, such as CD or DVD, I created a small TSR that intercepts file open requests and, if it detects one specific filename, redirects it to another file. Stick it in a batch file and substitute your custom config file for the one the game requests without having to change or edit the files on disk.

I wrote this little utility for my own use ages ago and figured others might just find it useful, so I cleaned it up and put it up for download. If even one other person has some use for it, I think that was worth it 😁

BTW, before you comment about the specific example: yes, I know that many of Sierra's SCI games allow you to specify the name of the config file on the command line, so "sierra mt32.cfg" would have worked just as well, it was just the first example that came to mind. Just pretend I meant Silpheed, which (to my knowledge) doesn't support it 😜