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File Version : 5.1.2501.0 built by: WinDDK
Description : OPL3-SAx Sound System (WDM)
Copyright : Copyright (C) Yamaha Corp. 1996-2001
Product Version : 5.1.2501.0
Product Name : Yamaha OPL3
Company Name : Yamaha Corp.
Internal Name : OPL3SAx.SYS
File Size: 54528 byte(s) 53.256 KB
MD5 : 221d171a602f964d0567c9c90e82fd92
SHA1: 344753A68CD307DD2B1F90A5693FE69EB6BD1458

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