<s>
Microsoft	O
Help	O
2.x	O
is	O
a	O
proprietary	O
format	O
for	O
online	B-Protocol
help	I-Protocol
files	O
,	O
developed	O
by	O
Microsoft	O
and	O
first	O
released	O
in	O
2001	O
as	O
a	O
help	B-Protocol
system	I-Protocol
for	O
Visual	B-Application
Studio	I-Application
.NET	O
(	O
2002	O
)	O
and	O
MSDN	O
Library	O
.	O
</s>
<s>
Microsoft	O
Help	O
2.x	O
is	O
the	O
help	O
engine	O
used	O
in	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
2002/2003/2005/2008	O
and	O
Office	B-Application
2007	I-Application
and	O
Office	B-Operating_System
2010	I-Operating_System
.	O
</s>
<s>
Help	B-Protocol
files	I-Protocol
are	O
made	O
with	O
the	O
Help	O
2.0	O
Workshop	O
(	O
VSHIK	O
)	O
,	O
a	O
help	B-Protocol
authoring	I-Protocol
tool	I-Protocol
.	O
</s>
<s>
Visual	B-Application
Studio	I-Application
2010	O
uses	O
a	O
new	O
help	O
engine	O
,	O
Microsoft	B-Protocol
Help	I-Protocol
Viewer	I-Protocol
.	O
</s>
<s>
January	O
2003	O
—	O
Microsoft	O
decided	O
not	O
to	O
release	O
Microsoft	B-Protocol
Help	I-Protocol
2	I-Protocol
as	O
a	O
general	O
Help	O
platform	O
.	O
</s>
<s>
Help	O
2	O
remained	O
a	O
Visual	B-Application
Studio	I-Application
Help	O
integration	O
tool	O
.	O
</s>
<s>
Documentation	O
is	O
all	O
in	O
Microsoft	B-Protocol
Help	I-Protocol
2	I-Protocol
format	O
and	O
displayed	O
in	O
Microsoft	O
Document	O
Explorer	O
.	O
</s>
<s>
December	O
2005	O
—	O
Microsoft	O
continues	O
support	O
of	O
Help	O
2	O
by	O
releasing	O
the	O
Help	O
Integration	O
Wizard	O
which	O
is	O
Visual	B-Application
Studio	I-Application
2005	O
compatible	O
.	O
</s>
<s>
December	O
2006	O
—	O
Office	B-Application
2007	I-Application
is	O
released	O
and	O
uses	O
Microsoft	B-Protocol
Help	I-Protocol
2	I-Protocol
.	O
</s>
<s>
The	O
Office	O
help	B-Protocol
viewer	I-Protocol
is	O
a	O
custom	O
viewer	O
that	O
can	O
only	O
view	O
Office	B-Application
2007	I-Application
help	O
.	O
</s>
<s>
April	O
2009	O
—	O
Microsoft	O
announced	O
at	O
2009	O
WritersUA	O
conference	O
that	O
Microsoft	B-Protocol
Help	I-Protocol
System	I-Protocol
1.x	O
(	O
development	O
name	O
was	O
MS	O
Help	O
3	O
)	O
will	O
ship	O
with	O
Visual	B-Application
Studio	I-Application
2010	O
.	O
</s>
<s>
A	O
Microsoft	O
Help	O
2.x	O
file	O
has	O
a	O
"	O
.hxs	B-Protocol
"	O
extension	O
.	O
</s>
<s>
A	O
compressed	O
.HxS	B-Protocol
help	B-Protocol
file	I-Protocol
(	O
help	O
title	O
)	O
is	O
compiled	O
from	O
a	O
set	O
of	O
topic	O
pages	O
written	O
in	O
a	O
subset	O
of	O
HTML	B-Language
(	O
much	O
like	O
its	O
CHM	O
predecessor	O
)	O
,	O
a	O
.HxC	O
main	O
project	O
file	O
,	O
an	O
.HxF	O
include	O
file	O
,	O
a	O
.HxT	O
table	O
of	O
contents	O
,	O
a	O
.HxA	O
attribute	O
definition	O
file	O
,	O
and	O
a	O
number	O
of	O
.HxK	O
indexes	O
(	O
keyword	O
Index	O
,	O
NamedURL	O
index	O
,	O
optional	O
associated	O
and	O
context	O
links	O
indexes	O
)	O
.	O
</s>
<s>
This	O
format	O
was	O
originally	O
intended	O
only	O
for	O
the	O
help	B-Protocol
system	I-Protocol
used	O
by	O
Visual	B-Application
Studio	I-Application
.NET	I-Application
2002	I-Application
help	O
,	O
MSDN	O
Library	O
and	O
TechNet	O
,	O
but	O
now	O
it	O
is	O
used	O
in	O
Office	B-Application
2007	I-Application
and	O
some	O
IDEs	B-Application
,	O
such	O
as	O
Borland	O
Developer	O
Studio	O
.	O
</s>
<s>
An	O
Assistance	O
Platform	O
(	O
AP	O
)	O
help	O
format	O
based	O
on	O
a	O
new	O
XML-based	O
markup	O
language	O
called	O
Microsoft	B-Protocol
Assistance	I-Protocol
Markup	I-Protocol
Language	I-Protocol
was	O
originally	O
part	O
of	O
the	O
Longhorn	O
project	O
.	O
</s>
