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Registering an extension in Windows 7

Posted on 2010-01-09
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Last Modified: 2013-12-03
I've had a C++ (MFC VC 6.0) application running for years.

As part of it, it registers the .fre extension to the application. The .exe is in a folder in C://Program Files.

Under Windows 7, it installs normatlly, but the registration code doesn't seem to work. The system doesn't seem to know about the .fre extension after it runs.

I've included the code below. What do I need to change to work under W7 ?

CMultiDocTemplate* pDocTemplate;
pDocTemplate = new CMultiDocTemplate(
  IDR_WINFRETYPE,      // Winfree\nF00_\nWinfree Document\n\\
            //Winfree Files (*.fre)\n.fre\nWinfreeFile\nWinFree File
  RUNTIME_CLASS(CWinfreeDoc),
  RUNTIME_CLASS(CMDIChildWnd),        // standard MDI child frame
  RUNTIME_CLASS(CWinfreeView));
AddDocTemplate(pDocTemplate);
RegisterShellFileTypes( );                  // added to register .fre
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Question by:DickStone
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4 Comments
 
LVL 49

Expert Comment

by:DanRollins
ID: 26276121
It should work under Win7.  I suggest that you see how far (if at all) it got by using RegEdit.  Look in HKCR for .fre  and the actual commad etc, should be under frefiles
The most common problem with Win7 is the UAC  -- it prevents non-administrators from monekying with the registry.  You should set up the file associations during installation so the user will not need to promote to administrator during each run.
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Author Comment

by:DickStone
ID: 26277510
I don't know how to change the installation to register the .fre file at the location of the .exe.

I'm attaching the InstallShield script if you can help with this...

Also, this script might also be having installation problems with W7 (64 bit), but I'm not sure.
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LVL 49

Accepted Solution

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DanRollins earned 2000 total points
ID: 26281881
One possibility from http://msdn.microsoft.com/en-us/library/538tbk4a(VS.71).aspx 
e registration database already associates a given filename extension with another file type, no new association is created. See the CDocTemplate class for the format of strings necessary to register this information.
Check to see if the .FRE file extension has been put in place by a different program (perhaps an older version of your own program).
Another thing to try:
Use the ClassWizard to create base-minimal MDI project.  In the Wizard, set the file type to XYZ (or some other file extension that is not registered -- again, I urge you to use RegEdit to check out the HKCR section).
Run the program on the problem platform and see if XYZ files are correctly registered for you.  If so, then the problem may be with the format of your IDR_WINFRETYPE string in your resource file.  Note: There can be more than one of these, depending on the national language.  Compare your string to the one the ClasssWizard creates for your testing program.
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Author Comment

by:DickStone
ID: 26341197
Do you know someone that is strong on InstallShield that I could pay to update the installation file for me for (1) adding registration, (2) fixing 64 installation issues?
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