How to change filetype association in the registry?

c# .net registry file-extension
Sergio Tapia picture Sergio Tapia · Jul 4, 2009 · Viewed 11.4k times · Source

first time posting in StackOverflow. :D I need my software to add a couple of things in the registry.

My program will use

Process.Start(@"blblabla.smc");

to launch a file, but the problem is that most likely the user will not have a program set as default application for the particular file extension.

How can I add file associations to the WindowsRegistry?

Answer

ars picture ars · Jul 4, 2009

In addition to the answers already provided, you can accomplish this by calling the command line programs "ASSOC" and "FTYPE". FTYPE associates a file type with a program. ASSOC associates a file extension with the file type specified through FTYPE. For example:

FTYPE SMCFile="C:\some_path\SMCProgram.exe" -some_option %1 %*
ASSOC .smc=SMCFile

This will make the necessary entries in the registry. For more information, type ASSOC /? or FTYPE /? at the command prompt.

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