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File version : 5070.10.3280.1335
Description : APPNAPI library
Copyright : Copyright (C) IBM Corp. 1989, 2003
Product Version : 5.7.1
Product Name : Personal Communications
Company Name : IBM Corporation
Internal name : APPNAPI.SYS
File Size: 119136 byte(s) 116.352 KB
MD5 : 0c46f8b7c5fd09a8e6a6665c7a59079d
SHA1: 94EFCC27EBE32ED0B552B049723CB1ED502A5B24

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How to Install appnapi.sys
Repair Sys ProblemsFixing a corrupted or missing appnapi.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.