Customize a file icon

I've created a file in my application using the method Create from CFile.  The extension was ".cfg" an I wanted to have an icon made by my own associated to it so I could see it in the Explorer. How can I do it inside the code?  
   
marakrAsked:
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galkinCommented:
You must create registry key ".cfg" under HKEY_CLASSES_ROOT. This key should have only one default value, which is desription of the file extension, say it is "cfgfile". Then you must create another key with the name of this description under the same HKEY_CLASSES_ROOT. In this case "cfgfile". This key in turn must have subkey "DefaultIcon" and its default value is path to EXE, DLL or ICO file followed by comma followed by icon index or icon ID prepended by minus.
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RONSLOWCommented:
If your application is the one which is the server for this file type (ie. should be the one that knows how to open it and therefore has a doc template for it) then MFC should take care of this for you .. there should be an icon with the same ID as the doc info string (and menu) that your file type uses.

If this is some other sort of file type that is not handled by your program, then use the method proposed by galkin

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