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File version : 6.2.9200.16384 (win8_rtm.120725-1247)
Description : Bluetooth Hands-free Audio Device Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 6.2.9200.16384
Product Name : Microsoft Windows Operating System
Company Name : Microsoft Corporation
Internal name : BthHFAud.sys
File Size: 30720 byte(s) 30.0 KB
MD5 : ec6c5e59cf2a07befdf741760bed507e
SHA1: 91A355E7EA165ABB5014431A9712C039B398945F

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