<s>
In	O
computing	O
,	O
ftype	B-Device
is	O
a	O
command-line	B-Application
utility	O
on	O
Microsoft	B-Application
Windows	I-Application
that	O
is	O
used	O
to	O
display	O
or	O
change	O
the	O
link	O
between	O
a	O
file	O
type	O
and	O
an	O
executable	B-Application
program	I-Application
.	O
</s>
<s>
The	O
ftype	B-Device
command	B-Application
was	O
introduced	O
as	O
a	O
shell	O
builtin	O
to	O
cmd.exe	B-Device
with	O
the	O
release	O
of	O
Windows	B-Device
NT	I-Device
4.0	I-Device
.	O
</s>
<s>
It	O
lists	O
all	O
Registry	B-Protocol
keys	I-Protocol
in	O
HKEY	B-Protocol
CLASSES	O
ROOT	O
which	O
contain	O
the	O
subkey	O
,	O
and	O
prints	O
out	O
the	O
REG	O
SZ	O
contents	O
of	O
the	O
value	O
within	O
these	O
keys	O
.	O
</s>
<s>
Since	O
it	O
is	O
an	O
internal	O
command	B-Application
built	O
into	O
cmd.exe	B-Device
,	O
there	O
is	O
no	O
FTYPE.EXE	O
.	O
</s>
<s>
Because	O
values	O
in	O
contain	O
information	O
on	O
how	O
to	O
open	O
file	O
types	O
with	O
registered	O
extensions	O
,	O
this	O
command	B-Application
essentially	O
lists	O
all	O
registered	O
file	O
types	O
,	O
and	O
which	O
executables	B-Application
are	O
used	O
to	O
open	O
them	O
,	O
along	O
with	O
any	O
switches	O
used	O
by	O
the	O
executable	B-Application
.	O
</s>
<s>
Multiple	O
file	O
extensions	O
can	O
be	O
associated	O
with	O
the	O
same	O
file	O
type	O
and	O
several	O
file	O
types	O
can	O
be	O
linked	O
to	O
the	O
same	O
executable	B-Application
application	O
.	O
</s>
