Microsoft KB Archive/101560

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Odd MSAV Behavior when CHKLIST.MS Files Are Read-Only

PSS ID Number: 101560

Article Last Modified on 11/22/1999

The information in this article applies to:

  • Microsoft MS-DOS operating system 6.0
  • Microsoft MS-DOS operating system 6.2
  • Microsoft MS-DOS operating system 6.21
  • Microsoft MS-DOS operating system 6.22

This article was previously published under Q101560


By default, Microsoft Anti-Virus and Microsoft Anti-Virus for Windows store a CHKLIST.MS file (marked with the Archive file attribute) in each directory they scan. If the CHKLIST.MS file has a Read-Only, System, or Hidden file attribute, certain Anti-Virus functions do not work.


When a file (such as CONFIG.SYS) changes, Anti-Virus detects the change and asks to update the file. If the file has a Read-Only, System, or Hidden attribute, Anti-Virus does not update the CHKLIST.MS file even if you choose to update it.

This problem also occurs on network drives when you do not have write privileges to a directory Anti-Virus is scanning.

If the CHKLIST.MS files have the Read-Only attribute set when you choose Delete CHKLIST Files, the files are not deleted; however, Microsoft Anti-Virus gives no indication that the files were not deleted. System and Hidden attributes have no effect on this process.


To work around this problem, remove any Read-Only, Hidden, or System file attributes from the CHKLIST.MS files. If you are scanning a network drive, you must have write privileges to all directories scanned by Anti-Virus.

Additional query words: 6.22 6.00 MSAV MWAV 6.20

Keywords: KB101560
Technology: kbMSDOS600 kbMSDOS620 kbMSDOS621 kbMSDOS622 kbMSDOSSearch