i tried to reproduce your error and i seriously couldn't
i tried using long directory names, mounting it in other than c drive, different versions of dosbox, changed filerights
what is the dosbox version you use? did you use different configuration files? are you using a front end? provide as many details as possible. also, does your mario teaches typing directory contain 165 files of their cumulative size 2 357 972 bytes?
also updaters: why the hell is default sound set to be pc speaker and not sound blaster?
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