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File version : 5070.10.3280.1335
Description : APPNBASE library
Copyright : Copyright (C) IBM Corp. 1989, 2003
Product Version : 5.7.1
Product Name : Personal Communications
Company Name : IBM Corporation
Internal name : APPNBASE.SYS
File Size: 195072 byte(s) 190.512 KB
MD5 : 75c42d83c4e5ecc716878b7862f54094
SHA1: A684E13204DC9B88D5AE3E99712F908087A2FD46

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How to Install appnbase.sys
Repair Sys ProblemsFixing a corrupted or missing appnbase.sys error is an easy process with a few steps. Open the zip-file you downloaded.Extract the .sys file to a location on your computer. We recommend you to unzip the file to the directory of the program that is requesting the file.
If that doesn't work, you will have to extract the file to your system directory.
By default, this is C:/WINNT/system32/drivers (Windows NT/2000).
or C:/Windows/system32/drivers (Windows XP, Vista, 7).
Make sure overwrite any existing files (but make a backup copy of the original file)
That should be it. Although not necessary you can reboot your computer as well.