Knowledge Base

Int21 Random Write Fails Under Windows NT

Article ID: 137927

Article Last Modified on 11/1/2006

Microsoft Windows NT Workstation 3.51
Microsoft Windows NT Server 3.51

This article was previously published under Q137927

SYMPTOMS

An Int21 call, Random Write (22H), from a client running Windows for Workgroups or Windows95 to Windows NT fails. As a result, if you run an older application on the client that relies on the Int21 call, you cannot write to a network drive on computer running Windows NT server.

CAUSE

Reading the trace on SMB Response Open&X from Windows NT, the Open Mode is 0x00FF instead of 0x0072.

WORKAROUND

Use Handler functions instead of FCB calls.

RESOLUTION

To correct this problem, install the fix mentioned below.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 3.51. A fix to this problem is in development, but has not been regression-tested and may be destabilizing in production environments. Microsoft does not recommend implementing this fix at this time. Contact Microsoft Product Support Services for more information on the availability of this fix.

Additional query words: prodnt advance msdos programming (fcb section)

Keywords: kbother KB137927