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File Version : 6.00.6006.2
Description : A4Tech HID Mouse Filter Driver
Copyright : Copyright (C) A4Tech Co.,Ltd. 2001-2007
Product Version : 6.00.6006.2
Product Name : A4Tech Mouse Driver
Company Name : A4Tech Co.,Ltd.
Internal Name : Amusbprt.sys
File Size: 17920 byte(s) 17.512 KB
MD5 : 8f1db3d133197affa3a721953eb0988c
SHA1: 52AB784F626A4CEEDB572CE6607BF4D02893AE25

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How to Install ONHDFLPY.SYS
Repair Sys ProblemsFixing a corrupted or missing ONHDFLPY.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.