Possible Data Corruption by Microsoft Client
Network Clients include a cache to enhance network performance
(for more info on the basics of data-caches, see: Network Client-Cache).
If you work in a Multi-User environment, where users access
simultaneously the same data-files, please be aware about a
problem with the "Microsoft Network Client",
as documented by Microsoft in article ID: Q148367 (http://support.microsoft.com/support/kb/articles/q148/3/67.asp)
When you use the Microsoft Client for Microsoft Networks, a file
on a Microsoft networking server (such as a Microsoft Windows NT,
Windows95, Microsoft Windows for Workgroups, or Microsoft LAN
Manager server) may become
damaged or may contain invalid data if multiple workstations
access the file at the same time.
The network redirector (VREDIR.VXD) caches data locally for files
it accesses on a Microsoft networking server. If the file size does not change or if the
last modified time does not change within a two-second period,
the redirector reads file data from the locally stored cache
rather than from the file on the server.
This issue is resolved by the following updated file for
VREDIR.VXD version 4.00.1112
(dated 2/11/97) and later
The following file is available for download from the Microsoft
vrdrupd.exe (size: 215728 bytes)
another knowledge base article on a
similar subject: Q174371:
Database File Damage When Data Is Appended
Database programs running in Windows 95 OEM Service Release 2
(OSR2) or 2.1 (OSR 2.1) over a Microsoft network may damage the
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
Vredir.vxd version 4.00.1116 (dated 9/11/97) and later
For the download of this patch, please look-up the Microsoft
article Q174371, which includes the download link,
which was on my last visit: ftp://ftp.microsoft.com/softlib/mslfiles/vrdrupd.exe.
Which version do you have installed ?
||Use in the Start-Menu
Once it is located, make
a right-click on the name
to call up the context menu
and select Properties.
||Verify the size of the file.
- File version
- Product version
On my new Windows95 B,
I do NOT have the proper
Installation of the patch:
||Download the file
(via Q148367 ) and
||Agree to upgrade.
||It copies a few files
and is quickly done.
You need to reboot !
Verification of Installation:
||Use "Find" to search for
look at its properties.
||The new version of
||The current download
includes already the
file version 4.00.1116