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File version : V4.50 built by: WinDDK
Description : SELECT(R) Modem Filter Driver
Copyright : Copyright (c) 1997-2008 MCCI Corporation
Product Version : V4.50
Product Name : SELECT(R) Modem Filter Driver
Company Name : MCCI Corporation
Internal name : sw_smdfl.sys
File Size: 18944 byte(s) 18.512 KB
MD5 : f10f5c989a4e1253dc76b8f8cef6cdf3
SHA1: FAAD2DEDED99B989D5DA8A7889D66C218C807760

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