This hold all kind of accessing files on a Unix filesysten from DOS.
The msdos_dir_ent structure has much more than 28 bytes. Is this significant?
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Added compares to device so that newer versions of Foxpro which test directories using xx\yy\device perform closer to whats DOS does.
We probably should use llseek here for file > 2 GBytes
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returned size of struct dir_ent seems wrong at 28 bytes. */