Compatibility: 1.0+
Expects: AH    10H
DS:DX address of an open FCB
Returns: AL    0    if file closed without error
0ffH if file was not found where it was upon fn 0fH (open)
Info: Closes a file that was opened using an FCB.

The file entry must be in its original place in the current
default directory of the disk from which it was opened.

If the file IS found, the directory is updated, the file buffers
are flushed, and AL=00H upon return.

If the file IS NOT found, the directory is not updated, a variety
of unsavory things happen, and AL=0ffH upon return.

See Also: Fn 3eh (close file via handle)
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DOS Fn 10H: Close File via FCB