Represents the "F" entry of the launch action object.

It is defined as part of the PDF 1.0 specification.

It contains a FileSpecificationElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 203, page 422.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 207, page 513.

The file specification gives the file to launch on all platforms. For platform-specific launch parameters the Win, Mac, or Unix entries take precedence on their respective platforms.