Incomputing,ftype is acommand-line utility onMicrosoft Windows that is used to display or change the link between afile type and anexecutable program.^[1]

Theftypecommand was introduced as ashell builtin tocmd.exe with the release ofWindows NT 4.0. It lists allRegistry keys inHKEY CLASSES ROOT which contain theshell\open\command subkey, and prints out theREG SZ contents of the(default) value within these keys. Since it is an internal command built intocmd.exe, there is noFTYPE.EXE.

Because(default) values inHKEY_CLASSES_ROOT\<keyname>\shell\open\command contain information on how to openfile types with registered extensions, this command essentially lists all registered file types, and which executables are used to open them, along with any switches used by the executable.^[2]

Multiple file extensions can be associated with the same file type and several file types can be linked to the same executable application.^[3]

• File format
• Filename extension
• File association

• Hill, Tim (1998).Windows NT Shell Scripting.Macmillan Technical Publishing.ISBN 978-1578700479.
• Frisch, Æleen (2001).Windows 2000 Commands Pocket Reference.O'Reilly.ISBN 978-0-596-00148-3.
• John Paul Mueller (2007).Windows Administration at the Command Line for Windows Vista, Windows 2003, Windows XP, and Windows 2000.John Wiley & Sons.ISBN 978-0470165799.

Wikibooks has a book on the topic of:Guide to Windows Commands

• ftype | Microsoft Docs

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