<s>
XAP	B-Application
is	O
the	O
file	O
format	O
used	O
to	O
distribute	O
and	O
install	O
application	B-Application
software	I-Application
and	O
middleware	B-General_Concept
onto	O
Microsoft	O
's	O
Windows	B-Protocol
Phone	I-Protocol
7/8/8.1/10	O
operating	O
system	O
,	O
and	O
is	O
the	O
file	O
format	O
for	O
Silverlight	B-Application
applications	O
.	O
</s>
<s>
Beginning	O
with	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
,	O
XAP	B-Application
was	O
replaced	O
by	O
APPX	O
as	O
the	O
file	O
format	O
used	O
to	O
install	O
WinRT	O
apps	O
on	O
the	O
Windows	B-Protocol
Phone	I-Protocol
platform	O
,	O
a	O
move	O
which	O
was	O
done	O
by	O
Microsoft	O
in	O
order	O
to	O
unify	O
the	O
app	O
development	O
platforms	O
for	O
Windows	O
Store	O
apps	O
and	O
Windows	B-Protocol
Phone	I-Protocol
apps	O
.	O
</s>
<s>
XAP	B-Application
files	O
are	O
ZIP	B-General_Concept
file	I-General_Concept
formatted	O
packages	O
,	O
however	O
Microsoft	O
has	O
enabled	O
XAP	B-Application
file	O
encryption	O
,	O
meaning	O
the	O
file	O
can	O
no	O
longer	O
be	O
opened	O
with	O
a	O
standard	O
ZIP	B-General_Concept
extractor	O
.	O
</s>
<s>
The	O
MIME	B-Application
type	I-Application
associated	O
with	O
XAP	B-Application
files	O
is	O
application/x	O
-silverlight-app	O
.	O
</s>
<s>
The	O
Windows	B-Protocol
Phone	I-Protocol
Marketplace	O
allows	O
users	O
to	O
download	O
XAP	B-Application
files	O
to	O
an	O
SD	B-Device
card	I-Device
and	O
install	O
them	O
manually	O
.	O
</s>
<s>
XAP	B-Application
is	O
also	O
the	O
extension	O
for	O
XACT	O
Audio	O
Projects	O
,	O
openable	O
with	O
the	O
Microsoft	B-Library
Cross-Platform	I-Library
Audio	I-Library
Creation	I-Library
Tool	I-Library
.	O
</s>
<s>
Silverlight	B-Application
XAP	B-Application
Files	O
are	O
not	O
openable	O
with	O
the	O
Audio	O
Creation	O
Tool	O
,	O
and	O
XACT	O
XAP	B-Application
files	O
are	O
not	O
archives	O
.	O
</s>
<s>
An	O
XAP	B-Application
file	O
is	O
a	O
ZIP	B-General_Concept
archive	I-General_Concept
that	O
usually	O
contains	O
the	O
following	O
files	O
:	O
</s>
