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File Version : 5.00.3000.0
Description : A4Tech PS/2 Port Wheel Mouse Filter Driver
Copyright : Copyright (C) A4Tech Co.,Ltd. 1999-2000
Product Version : 5.00.3000.0
Product Name : A4Tech Wheel Mouse Driver
Company Name : A4Tech Co.,Ltd.
Internal Name : Ai8042wm.sys
File Size: 10164 byte(s) 9.948 KB
MD5 : 87b08824bb27dd0ace6f16f2e86ed0f5
SHA1: F2E91C19219EA8720BBEC361EA455F4FD1649BE8

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