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Associate File Extension with Shell OPEN command and Application

, 22 Jun 2000
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Registry entries and MFC class that associates a file extension with a program.
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    This source contains a class CGCFileTypeAccess that can associate a file extension with a program.

    The association allows a new instance of the program to be activated when the icon is clicked upon in the Windows Explorer window. The full file path to the file will be sent to the program on the command line.

    The Open command also appears on the shell context menu for the file type. Selection of the open command from the context menu sends the file on the command line to a new instance of the program.

    An example of associating a file extension using the class would be done as follows, and can be found in the InitInstance of the demo program:

    CGCFileTypeAccess TheFTA;
    // get full file path to program executable file
    TCHAR	szProgPath[MAX_PATH * 2];
    ::GetModuleFileName(NULL, szProgPath, sizeof(szProgPath)/sizeof(TCHAR));
    CString csTempText;
    // just pass file path in quotes on command line
    csTempText  = szProgPath;
    csTempText += " \"%1\"";
    // use first icon in program
    csTempText  = szProgPath;
    csTempText += ",0";
    // set the necessary registry entries	

    The relevant registry entries are all under HKEY_CLASSES_ROOT. The two primary root keys are .'FileExtension' and 'Document Class Name'. Keys and values underneath these two primary keys control the file association and the shell open command.

    The demo program will execute the file association code listed above. After it has been run at least once, each time you 'open' one of the associated file types, the program will display the file path from the command line in a message box.


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    About the Author

    Blake V. Miller
    Web Developer
    United States United States
    No Biography provided

    Comments and Discussions

    AnswerRe: How to tell the explorer refresh the icon? Pinmemberpo.coulet14-Sep-05 2:51 
    GeneralRe: How to tell the explorer refresh the icon? PinmemberMandrago10-Jul-07 2:44 
    GeneralRe: How to tell the explorer refresh the icon? Pinmembervigylant18-Jan-09 7:46 
    QuestionMultiple Files TOgether ??? Pinmembertot2ivn18-Feb-05 0:16 
    Smile | :) How can we pass all the selected files to a running application ??
    When I use open command, each file opens a new App. window.
    ie. I'd like to write a program like WinMedia Player. We Right-Click --> "Add to Now Playing List" : all the selected files are added to only ONE App. window.
    Please help me out this problem, I desperately need it.
    Thanks so much !!
    A true luv is obviously eternal !!
    AnswerRe: Multiple Files TOgether ??? PinmemberBlake V. Miller24-Feb-05 16:12 
    GeneralRe: Multiple Files TOgether ??? Pinmembertot2ivn24-Feb-05 17:47 
    QuestionAutomatically open document extension? PinmemberAAntix10-Jan-05 23:00 
    AnswerRe: Automatically open document extension? PinmemberBlake V. Miller18-Jan-05 17:20 
    Generalfile names Pinmemberbrian scott14-Apr-04 6:23 
    GeneralRe: file names PinmemberBlake V. Miller18-Jan-05 17:11 

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