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File version :
Description : Qualcomm Atheros Ar81xx series PCI-E Gigabit Ethernet Controller
Copyright : 2001-2012 Qualcomm Atheros Co., Ltd. All Rights Reserved.
Product Version :
Product Name : Qualcomm Atheros Ar81xx series PCI-E Gigabit Ethernet Controller
Company Name : Qualcomm Atheros Co., Ltd.
Internal name : L1c63x64.sys
File Size: 100864 byte(s) 98.512 KB
MD5 : 8412d334f6b18f655bff430e9db1abc6
SHA1: 2CA2517B1E698EF1F858F53A8F0472F8777A9235

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How to Install L1C63x64.sys
Repair Sys ProblemsFixing a corrupted or missing L1C63x64.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.