Ftype

ftypeDeveloper(s)| Microsoft

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Initial release| August 24, 1996; 29 years ago (1996-08-24)
Operating system| Microsoft Windows
Type| Command
License| Proprietary commercial software
Website| docs.microsoft.com/en-us/windows-server/administration/windows-commands/ftype

In computing, `ftype` is a command-line utility on Microsoft Windows that is used to display or change the link between a file type and an executable program.[1]

## Overview

The `ftype` command was introduced as a shell builtin to cmd.exe with the release of Windows NT 4.0. It lists all Registry keys in HKEY CLASSES ROOT which contain the shell\open\command subkey, and prints out the REG SZ contents of the (default) value within these keys. Since it is an internal command built into `cmd.exe`, there is no `FTYPE.EXE`.

Because (default) values in HKEY_CLASSES_ROOT\<keyname>\shell\open\command contain information on how to open file 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]

## See also

* File format
* Filename extension
* File association

## References

1. ↑ "MS-DOS and Windows command line ftype command". https://www.computerhope.com/ftype.htm.
2. ↑ "Ftype". https://technet.microsoft.com/en-us/library/bb490912.aspx.
3. ↑ "Ftype - File type - Windows CMD - SS64.com". https://ss64.com/nt/ftype.html.

## Further reading

* Windows NT Shell Scripting. Macmillan Technical Publishing. 1998. ISBN 978-1578700479. https://archive.org/details/windowsntshellsc0000hill.
* 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.

## External links

* ftype | Microsoft Docs

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