MAKEMSI quickly and reliably creates MSI files in a non-programmatic way\Source CodeCommandsExtn

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The "Extn" Command

This command is used to define a file extension and associate it with a "ProgId" and one or more actions that can be performed on the extension.

This command can not be nested and is required before the "ExtnAction" command can be used.

This command takes these parameters:

• File Extension (positional)
  This is the value of the file extension. The leading "." is optional, if found it is removed. This value is almost always supplied, it would not be supplied if you wished to modify an existing ProgId.

• Component (optional)
  If not passed then the extension is assigned to the "current component". The component's attributes control installation and uninstallation conditions and behaviour.

• ProgId (optional)
  This value is required if the "File extension" is missing otherwise one will be generated based if required.

• Description (optional)
  This is the description for the "ProgId".

• Icon (optional)
  This is full name of an ico file, or perhaps a EXE or DLL file and resource number.

• AlwaysShow (optional)
  Explorer can be configured (and it is the default) to hide file extensions. If you pass "Y" (in fact anything but "N") for this value then the file extension will always be displayed.

• KeyPath (optional)
  If this file value should be the keypath for the component then pass "Y" for this parameter.

EXAMPLE

<$Component "TestExtnMacro" Create="Y" Directory_="INSTALLDIR">
   <$Extn ".TestExtn" KEYPATH="Y" Description="Test Extension">
       <$ExtnAction Key="Open" Description="EDIT FILE" Command=^notepad.exe "%1"^>
   <$/Extn>
<$/Component>

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