<s>
A	O
.ZAP	O
File	O
(	O
Zero	O
Administration	O
Package	O
)	O
is	O
a	O
text	O
file	O
,	O
which	O
allows	O
the	O
publishing	O
of	O
an	O
application	O
to	O
a	O
user	O
on	O
a	O
Microsoft	B-Application
Windows	I-Application
system	O
(	O
Windows	B-Application
2000	I-Application
,	O
XP	B-Application
Professional	I-Application
,	O
Windows	B-Application
Vista	I-Application
,	O
or	O
Windows	O
7	O
Professional	O
)	O
,	O
for	O
applications	O
for	O
which	O
a	O
.MSI	B-Application
file	O
does	O
not	O
exist	O
.	O
</s>
<s>
It	O
is	O
used	O
in	O
Active	B-Protocol
Directory	I-Protocol
Domains	B-General_Concept
and	O
is	O
installed	O
using	O
a	O
Group	O
Policy	O
.	O
</s>
<s>
The	O
.ZAP	O
file	O
is	O
more	O
restricted	O
than	O
a	O
.MSI	B-Application
file	O
in	O
that	O
it	O
cannot	O
be	O
rolled	O
back	O
if	O
the	O
application	O
fails	O
to	O
install	O
correctly	O
,	O
cannot	O
use	O
elevated	O
privileges	O
to	O
install	O
itself	O
(	O
i.e.	O
</s>
<s>
However	O
,	O
running	O
an	O
Executable	B-Application
file	I-Application
(	O
such	O
as	O
setup.exe	B-Application
)	O
often	O
bypasses	O
quiet	O
,	O
passive	O
or	O
silent	O
installation	O
switches	O
,	O
even	O
if	O
specified	O
in	O
the	O
SetupCommand	O
.	O
</s>
<s>
Instead	O
,	O
the	O
software	O
remains	O
installed	O
on	O
the	O
machine	O
permanently	O
,	O
unlike	O
a	O
.MSI	B-Application
installation	O
which	O
can	O
be	O
set	O
to	O
uninstall	O
when	O
the	O
Computer	O
is	O
removed	O
from	O
the	O
relevant	O
OU	B-Protocol
.	O
</s>
<s>
After	O
creating	O
a	O
.ZAP	O
file	O
and	O
placing	O
it	O
in	O
an	O
accessible	O
share	O
-	O
usually	O
creating	O
an	O
Active	B-Protocol
Directory	I-Protocol
Group	O
with	O
access	O
to	O
this	O
location	O
-	O
the	O
Systems	O
Administrator	O
needs	O
to	O
create	O
a	O
Group	O
Policy	O
Object	O
,	O
open	O
the	O
editing	O
screen	O
,	O
select	O
User	O
Configuration	O
,	O
Software	O
Settings	O
and	O
Software	O
Installation	O
and	O
create	O
a	O
New	O
Package	O
to	O
the	O
location	O
of	O
the	O
.ZAP	O
file	O
.	O
</s>
<s>
Since	O
GPOs	O
default	O
to	O
.MSI	B-Application
,	O
the	O
System	O
Admin	O
needs	O
to	O
ensure	O
that	O
they	O
search	O
for	O
.ZAP	O
files	O
,	O
instead	O
of	O
.MSI	B-Application
files	O
.	O
</s>
<s>
Accepting	O
the	O
new	O
package	O
and	O
assigning	O
the	O
GPO	O
to	O
the	O
relevant	O
Organizational	B-Protocol
Unit	I-Protocol
(	O
OU	B-Protocol
)	O
will	O
publish	O
the	O
application	O
.	O
</s>
