SUBST, JOIN, and APPEND Commands with Windows

This article was previously published under Q71667
This article has been archived. It is offered "as is" and will no longer be updated.
The MS-DOS commands APPEND, SUBST, and JOIN modify the way MS-DOSsearches for files. This can cause problems with certain applications,including Microsoft Windows and Windows for Workgroups.

Windows 3.0

The README.TXT that comes with Microsoft Windows version 3.0 includesthe following:
   Omit the APPEND, JOIN, and SUBST MS-DOS Utilities   -------------------------------------------------   The MS-DOS utilities APPEND, JOIN, and SUBST can cause problems   when you are running Windows 3.0. If you included APPEND, JOIN,   or SUBST in your AUTOEXEC.BAT file, remove them and refrain from   running them within Windows.				
If any of these commands are in the AUTOEXEC.BAT file when MicrosoftWindows 3.0 is installed, they can cause the installation to becorrupted. This can cause the unrecoverable application errors (UAEs)to continue to occur even after the APPEND, JOIN, and SUBST commandsare removed from the AUTOEXEC.BAT file.

These commands can also cause intermittent UAEs if they are addedafter the installation of Windows. Therefore, customers who useMicrosoft Windows 3.0 should be warned when these commands are addedto the AUTOEXEC.BAT files.

Windows 3.1

The MS-DOS utilities APPEND, JOIN, and SUBST are listed in the[incompTSR2] section of the SETUP.INF file. If you are running theseprograms when you run Windows Setup, you receive the followingmessage:
SETUP has found the programs listed below on your system. When SETUP or Windows runs with some versions of these programs, your system may fail. It is recommended that you quit Setup now and look in the file SETUP.TXT for information about using the programs with Setup or Windows. Then run Setup again.
For more information on the SUBST, JOIN, and APPEND commands, query onthe following words:
subst and path and msdos


subst and join and append
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Article ID: 71667 - Last Review: 02/27/2014 21:01:45 - Revision: 4.0

  • Microsoft MS-DOS 4.0 Standard Edition
  • Microsoft MS-DOS 5.0 Standard Edition
  • Microsoft Windows 3.0 Standard Edition
  • Microsoft Windows for Workgroups 3.1
  • Microsoft Windows for Workgroups 3.11
  • kbnosurvey kbarchive KB71667