How do I add an action to a file of a given mime-type?
The simplest way is to run File > New… > Module Development > Action which creates an action for you and registers it in your layer.xml.
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On the first tab, choose Conditionally Enabled action and select
DataObjectas the cookie class. -
On the second tab, check File Type Context Menu Item and choose the MIME type and position.
You can use text/html, text/x-java, text/x-ant+xml, text/x-jsp, image/png, etc.