<s>
App	B-Device
Installer	I-Device
is	O
a	O
software	O
component	O
of	O
Windows	B-Operating_System
10	I-Operating_System
,	O
introduced	O
in	O
the	O
2016	O
Anniversary	O
Update	O
,	O
used	O
for	O
the	O
installation	O
and	O
maintenance	O
of	O
applications	O
packaged	O
in	O
.appx	O
or	O
.appxbundle	O
installation	B-Application
packages	I-Application
;	O
they	O
are	O
loosely	O
relational	B-Application
databases	I-Application
with	O
an	O
XML	B-Protocol
app	O
manifest	O
.	O
</s>
<s>
The	O
.appx	O
and	O
.appxbundle	O
files	O
contain	O
either	O
a	O
Win32	B-Library
or	O
a	O
Universal	B-Device
Windows	I-Device
Platform	I-Device
app	O
,	O
icons	O
for	O
the	O
Start	O
menu	O
and	O
taskbar	O
,	O
a	O
virtualized	O
version	O
of	O
any	O
Windows	B-Protocol
Registry	I-Protocol
keys	O
needed	O
,	O
and	O
any	O
other	O
assets	O
needed	O
for	O
the	O
installed	O
app	O
to	O
function	O
.	O
</s>
<s>
The	O
only	O
other	O
Windows	O
components	O
capable	O
of	O
installing	O
APPX	O
packages	O
are	O
Windows	B-Application
Store	I-Application
and	O
Windows	B-Application
PowerShell	I-Application
.	O
</s>
<s>
App	B-Device
Installer	I-Device
provides	O
a	O
more	O
user-friendly	O
interface	O
that	O
is	O
opened	O
by	O
clicking	O
on	O
the	O
installation	O
package	O
.	O
</s>
<s>
The	O
design	O
for	O
App	B-Device
Installer	I-Device
is	O
similar	O
to	O
the	O
one	O
for	O
the	O
classic	O
Windows	B-Application
Installer	I-Application
,	O
which	O
installs	O
stand-alone	O
MSI	O
files	O
.	O
</s>
<s>
If	O
the	O
user	O
clicks	O
the	O
Install	O
button	O
at	O
the	O
bottom	O
right	O
corner	O
,	O
the	O
App	B-Device
Installer	I-Device
checks	O
the	O
app	O
's	O
digital	O
certificate	O
.	O
</s>
<s>
Unlike	O
a	O
standalone	O
installer	B-Operating_System
,	O
App	B-Device
Installer	I-Device
refuses	O
to	O
install	O
an	O
app	O
without	O
a	O
valid	O
digital	O
certificate	O
.	O
</s>
<s>
App	B-Device
Installer	I-Device
is	O
physically	O
more	O
flexible	O
than	O
Windows	B-Application
Installer	I-Application
.	O
</s>
<s>
It	O
can	O
be	O
resized	O
and	O
viewed	O
in	O
full-screen	O
mode	O
and	O
the	O
background	O
changes	O
based	O
on	O
the	O
system-wide	O
light	O
or	O
dark	B-General_Concept
mode	I-General_Concept
.	O
</s>
<s>
Apps	O
installed	O
with	O
App	B-Device
Installer	I-Device
can	O
be	O
updated	O
through	O
the	O
Windows	B-Application
Store	I-Application
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
to	O
update	O
an	O
app	O
with	O
App	B-Device
Installer	I-Device
by	O
opening	O
package	O
with	O
a	O
higher	O
version	O
number	O
than	O
the	O
one	O
installed	O
.	O
</s>
