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<fileAssociation> Element (ClickOnce Application)

Identifies a file extension to be associated with the application.

<fileAssociation
    xmlns="urn:schemas-microsoft-com:clickonce.v1"
    extension
    description
    progid
    defaultIcon
/>

The fileAssociation element is optional. The element has the following attributes.

Attribute

Description

extension

Required. The file extension to be associated with the application.

description

Required. A description of the file type for use by the shell.

progid

Required. A name uniquely identifying the file type.

defaultIcon

Required. Specifies the icon to use for files with this extension. The icon file must be specified by using the <file> Element (ClickOnce Application) within the <assembly> Element (ClickOnce Application) that contains this element.

This element must include an XML namespace reference to "urn:schemas-microsoft-com:clickonce.v1". If the <fileAssociation> element is used, it must come after the <application> element in its parent <assembly> Element (ClickOnce Application).

ClickOnce will not overwrite existing file associations. However, a ClickOnce application can override the file extension for the current user only. After that ClickOnce application is uninstalled, ClickOnce deletes the file association for the user, and the per-machine association is active again.

The following code example illustrates fileAssociation elements in an application manifest for a text editor application deployed using ClickOnce. This code example also includes the <file> Element (ClickOnce Application) required by the defaultIcon attribute.

  <file name="text.ico" size="4286">
    <hash>
      <dsig:Transforms>
        <dsig:Transform Algorithm="urn:schemas-microsoft-com:HashTransforms.Identity" />
      </dsig:Transforms>
      <dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
      <dsig:DigestValue>0joAqhmfeBb93ZneZv/oTMP2brY=</dsig:DigestValue>
    </hash>
  </file>
  <file name="writing.ico" size="9662">
    <hash>
      <dsig:Transforms>
        <dsig:Transform Algorithm="urn:schemas-microsoft-com:HashTransforms.Identity" />
      </dsig:Transforms>
      <dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
      <dsig:DigestValue>2cL2U7cm13nG40v9MQdxYKazIwI=</dsig:DigestValue>
    </hash>
  </file>
  <fileAssociation xmlns="urn:schemas-microsoft-com:clickonce.v1" extension=".text" description="Text  Document (ClickOnce)" progid="Text.Document" defaultIcon="text.ico" />
  <fileAssociation xmlns="urn:schemas-microsoft-com:clickonce.v1" extension=".writing" description="Writings (ClickOnce)" progid="Writing.Document" defaultIcon="writing.ico" />
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