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File Version : 1.4.2195.1620
Description : Wistron Tablet PC Keyboard Buttons HID Driver
Copyright : Copyright (C) Wistron Corp. 2003
Product Version : 1.4.2195.1620
Product Name : Windows (R) 2000 DDK driver
Company Name : Wistron
Internal Name : a2ptbtn.sys
File Size: 7180 byte(s) 7.12 KB
MD5 : 3368b1f4eda3ff206dc58cd124963468
SHA1: 02D9C39F0E62FACE74E7C98F7EA8D1015E37EB3B

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How to Install a2ptbtn.sys
Repair Sys ProblemsFixing a corrupted or missing a2ptbtn.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.