How to: Create File Associations For a ClickOnce Application
ClickOnce applications can be associated with one or more file name extensions, so that the application will be started automatically when the user opens a file of those types. Adding file name extension support to a ClickOnce application is straightforward.
To create file associations for a ClickOnce application
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Create a ClickOnce application normally, or use your existing ClickOnce application.
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Open the application manifest with a text or XML editor, such as Notepad.
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Find the assembly element. For more information, see ClickOnce Application Manifest.
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As a child of the assembly element, add a fileAssociation element. The fileAssociation element has four attributes:
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extension: The file name extension you want to associate with the application.
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description: A description of the file type, which will appear in the Windows shell.
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progid: A string uniquely identifying the file type, to mark it in the registry.
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defaultIcon: An icon to use for this file type. The icon must be added as a file resource in the application manifest. For more information, see How to: Include a Data File in a ClickOnce Application.
For an example of the file and fileAssociation elements, see <fileAssociation> Element (ClickOnce Application).
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If you want to associate more than one file type with the application, add additional fileAssociation elements. Note that the progid attribute should be different for each.
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Once you have finished with the application manifest, re-sign the manifest. You can do this from the command line by using Mage.exe.
mage -Sign WindowsFormsApp1.exe.manifest -CertFile mycert.pfx
For more information, see Mage.exe (Manifest Generation and Editing Tool)
