Microsoft KB Archive/174371

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Possible Database File Damage When Data Is Appended


The information in this article applies to:

  • Microsoft Windows 95 OEM Service Release, versions 2, 2.1


Database programs running in Windows 95 OEM Service Release 2 (OSR2) or 2.1 (OSR 2.1) over a Microsoft network may damage the database.


When a program uses the GetFileSize() API to get the size of an existing file on a Microsoft networking server (such as a Windows NT-based server), the Client for Microsoft Networks may not return the correct file size. When the program then attempts to write additional information to the end of the file, it may overwrite existing data instead.

This problem has been observed only with the version of the Client for Microsoft Networks (Vredir.vxd) included with OSR2 (version 4.00.1111) and later.


This issue is resolved by the following updated file for Windows 95 OSR2:

Vredir.vxd version 4.00.1116 (dated 9/11/97) and later

To install this update, follow these steps:

  1. Download the following file from the Microsoft Download Center:
  2. Double-click the Vredrupd.exe file that you downloaded in step 1.
  3. Follow the instructions on the screen.

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:

Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

The following files are installed by Vrdrupd.exe:

   File name     Version    Date/Time        Size     Destination folder
   Vredir.vxd    4.00.1116  9/11/97 11:16a   156,773  Windows\System
   Vnetsup.vxd   4.00.1112  5/30/97 11:12a    17,595  Windows\System 


For additional information about issues resolved by updates to this component, please see the following articles in the Microsoft Knowledge Base:

Q172594 Cannot Connect to Server with 15 Characters and Period in Name

Q165402 Windows 95 Update to Encrypt Passwords in Memory

Q161100 File May Be Truncated When Copied to a Full Network Drive

Q157114 "Access Denied" Attempting to Run File on LM/X Server

Q156497 Duplicate Print Output on PC-LAN Server from Windows 95 Client

Q152186 Possible Network Data Corruption If Locking Not Used

Q148367 Possible Network File Corruption with Redirector Caching

Q142803 Hang or Locking Error Accessing Database Files Over Network

Q140558 Deleting Files on Samba Servers May Delete Local Files Instead

Q138249 Updated Vredir.vxd Corrects Errors Running Files on LMX

Q160807 Cannot Connect to Windows NT Server with Many Shares

Q150215 Disabling Automatic Network Shortcut Resolution

Q138014 File May Be Truncated to Zero Bytes When Copied Onto Itself

Q136834 Error Copying Read-Only Files to Core SMB Server

Additional query words: corrupt

Keywords : kbfile kbnetwork osr2 win95 kbgraphxlinkcritical
Issue type :
Technology : kbWin95search kbOPKSearch kbWin95OPKOSR2 kbWin95OPKOSR210

Last Reviewed: June 1, 2001
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