Possible Database File Damage When Data Is Appended

 Last reviewed: September 26, 1997
Article ID: Q174371
The information in this article applies to:
  • Microsoft Windows 95 OEM Service Release versions 2, 2.1

SYMPTOMS

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.

CAUSE

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.

STATUS

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 Vrdrupd.exe file from the Microsoft Software Library to an empty folder.

  2. In My Computer or Windows Explorer, double-click the Vrdrupd.exe file you downloaded in step 1.

  3. Follow the instructions on the screen.

The following file is available for download from the Microsoft Software Library: 

 ~ Vrdrupd.exe (size: 215728 bytes)
For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online Services
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

MORE INFORMATION

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

   ARTICLE-ID: Q172594
   TITLE     : Cannot Connect to Server with 15 Characters and Period
               in Name

   ARTICLE-ID: Q165402
   TITLE     : Windows 95 Update to Encrypt Passwords in Memory

   ARTICLE-ID: Q161100
   TITLE     : File May Be Truncated When Copied to a Full Network Drive

   ARTICLE-ID: Q152186
   TITLE     : Possible Network Data Corruption If Locking Not Used

   ARTICLE-ID: Q148367
   TITLE     : Possible Network File Corruption with Redirector
               Caching

   ARTICLE-ID: Q142803
   TITLE     : Hang or Locking Error Accessing Database Files Over Network

   ARTICLE-ID: Q140558
   TITLE     : Deleting Files on Samba Servers May Delete Local Files
               Instead

   ARTICLE-ID: Q160807
   TITLE     : Cannot Connect to Windows NT Server with Many Shares

   ARTICLE-ID: Q150215
   TITLE     : Disabling Automatic Network Shortcut Resolution

   ARTICLE-ID: Q138014
   TITLE     : File May Be Truncated to Zero Bytes When Copied Onto Itself

   ARTICLE-ID: Q136834
   TITLE     : Error Copying Read-Only Files to Core SMB Server

Additional query words: corrupt
Keywords : osr2 win95 kbfile kbnetwork kbfixlist
Version : 95
Platform : WINDOWS

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Last reviewed: September 26, 1997
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