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DOCUME~1 is a (horrible) Windows feature that links DOS-type filenames (the 8.3 format) to "proper" filenames (longer and with less restrictive names). I suspect DOS (which version ?) does not know how to resolve those links. See https://en.wikipedia.org/wiki/8.3_filename.
DosBox as other MS-DOS applications may be finicky in terms of supporting long filenames, so you could simply create a folder with at most 8 chars and run your app from it.
DOCUME~1is a (horrible) Windows feature that links DOS-type filenames (the8.3format) to "proper" filenames (longer and with less restrictive names). I suspect DOS (which version ?) does not know how to resolve those links. Seehttps://en.wikipedia.org/wiki/8.3_filename.mountin the DosBox prompt and show the output.