In case, you are in need to register your .DLL file for any unexpected reason, you can follow these simple steps described below.

1. In Windows Click Start>Run
2. REGSVR32 filename.dll
3. Press enter and now filename.dll Registration into your Windows is Complete!

If the file is not located in your Windows System Folder then you have to add the file path before the “filename.dll”, For example :

D:\Games\CS Source 2013\Steam.dll