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File Version : V4.40
Description : Windows 2000/XP support functions
Copyright : Copyright (c) 1997-2007 MCCI Corporation
Product Version : V4.40
Product Name : Sony Ericsson Device 116 USB WMC OBEX Interface
Company Name : MCCI Corporation
Internal Name : s116cm.sys
File Size: 12424 byte(s) 12.136 KB
MD5 : 0c8f4ece9684fe64ecd09cad1797bb20
SHA1: 698080BE16A047987BA536BDD4521CAA5C0EE33D

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