<s>
An	O
.XIP	B-Application
file	O
is	O
a	O
XAR	B-Application
archive	I-Application
that	O
can	O
be	O
digitally	O
signed	O
for	O
integrity	O
.	O
</s>
<s>
The	O
.XIP	B-Application
file	O
format	O
was	O
introduced	O
in	O
OS	B-Operating_System
X	I-Operating_System
10.9	I-Operating_System
,	O
along	O
with	O
Apple	O
's	O
release	O
of	O
Swift	B-Application
.	O
</s>
<s>
.XIP	B-Application
allows	O
for	O
a	O
digital	O
signature	O
to	O
be	O
applied	O
and	O
verified	O
on	O
the	O
receiving	O
system	O
before	O
the	O
archive	O
is	O
expanded	O
.	O
</s>
<s>
Apple	O
has	O
reserved	O
the	O
right	O
to	O
use	O
the	O
.XIP	B-Application
file	O
format	O
exclusively	O
,	O
removing	O
it	O
from	O
public	O
use	O
since	O
release	O
.	O
</s>
<s>
Starting	O
with	O
macOS	O
Sierra	O
,	O
only	O
.XIP	B-Application
archives	O
signed	O
by	O
Apple	O
will	O
be	O
expanded	O
.	O
</s>
<s>
Developers	O
who	O
had	O
been	O
using	O
.XIP	B-Application
archives	O
were	O
required	O
to	O
move	O
to	O
using	O
signed	O
installer	O
packages	O
or	O
disk	O
images	O
.	O
</s>
