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File version : V4.16
Description : Windows 2000/XP support functions
Copyright : Copyright (c) MCCI 1997-2003
Product Version : V4.16
Product Name : Cygnal USB Composite Device
Company Name : MCCI
Internal name : cyg_wh.sys
File Size: 5776 byte(s) 5.656 KB
MD5 : 7bd313659cf06104fd5281437df1c8d1
SHA1: 59F1049A1014E978AD1AB49F299CE26B592A5D3D

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