extassociation DefCommandName property
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Applies to
acExtAssociation component.  

property DefCommandName: String;  

The DefCommandName property determines and specifies the text for default command which are used to open the file. The text for default command appears as first (default) item in the context menu for any shell objects.  

Snapshot (I just changed the DefCommandName for .TXT files)

See also
EXTENSION property.