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<fileAssociation> element (ClickOnce application)

Applies to: yesVisual Studio noVisual Studio for Mac

Note

This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

Identifies a file extension to be associated with the application.

Syntax

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

Elements and attributes

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 within the <assembly> Element that contains this element.

Remarks

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 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.

Example

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 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" />

See also