here is the Config File download:
https://www.mediafire.com/file/75gzekr2v5fpyrl/dosbox-0.74-OregonTrail.conf/file
And How to install/use it:
https://www.play-old-pc-games.com/compatibility-tools/custom-configuration-dosbox/#:~:text=Creating%20Custom%20configuration%20files%20in%20DOSBox&text=This%20can%20easily%20be%20done,with%20the%20edited%20settings%20file.

Here Is The Shorter Second Link:
https://tinyurl.com/OregonTrailFile