<s>
open	O
is	O
a	O
NeXTSTEP	B-Application
and	O
macOS	B-Application
command	B-Application
line	I-Application
process	B-Application
that	O
opens	O
files	O
,	O
folders	O
or	O
URLs	O
in	O
the	O
GUI	B-Application
as	O
though	O
the	O
user	O
had	O
double	O
clicked	O
on	O
them	O
.	O
</s>
<s>
Files	O
will	O
be	O
opened	O
in	O
the	O
default	O
application	O
for	O
their	O
type	O
,	O
folders	O
will	O
be	O
opened	O
in	O
the	O
Finder	O
or	O
file	O
system	O
GUI	B-Application
,	O
and	O
URLs	O
will	O
be	O
opened	O
in	O
the	O
default	O
browser	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
AppKit	B-Operating_System
API	O
,	O
which	O
is	O
stubbed	O
to	O
other	O
OS	O
alternatives	O
on	O
GNUstep	B-Application
if	O
a	O
GS	O
application	O
is	O
not	O
registered	O
for	O
a	O
file	O
.	O
</s>
<s>
Microsoft	B-Application
Windows	I-Application
:	O
</s>
<s>
X11	B-Operating_System
(	O
Unix-like	B-Operating_System
systems	I-Operating_System
)	O
:	O
</s>
<s>
xdg-utils	B-Application
:	O
</s>
<s>
KDE	B-Application
:	O
</s>
<s>
GNOME	B-Application
:	O
</s>
