(Required if the DOS, Mac, and Unix entries are all absent; amended with the UF entry for PDF 1.7) A file specification string of the form described in Section 3.10.1, “File Specification Strings,” or (if the file system is URL) a uniform resource locator, as described in Section 3.10.4, “URL Specifications.” Note: It is recommended that the UF entry be used in addition to the F entry. The UF entry provides cross-platform and cross-language compatibility and the F entry provides backwards compatibility

public const string F

Public Const F As String

public:
literal String^ F