<s>
.doc	B-Operating_System
(	O
an	O
abbreviation	O
of	O
"	O
document	O
"	O
)	O
is	O
a	O
filename	O
extension	O
used	O
for	O
word	B-General_Concept
processing	I-General_Concept
documents	O
stored	O
on	O
Microsoft	O
's	O
proprietary	O
Microsoft	B-Operating_System
Word	I-Operating_System
Binary	I-Operating_System
File	I-Operating_System
Format	I-Operating_System
.	O
</s>
<s>
Binary	O
DOC	B-Operating_System
files	I-Operating_System
often	O
contain	O
more	O
text	O
formatting	O
information	O
(	O
as	O
well	O
as	O
scripts	O
and	O
undo	O
information	O
)	O
than	O
some	O
other	O
document	O
file	O
formats	O
like	O
Rich	O
Text	O
Format	O
and	O
Hypertext	B-Language
Markup	I-Language
Language	I-Language
,	O
but	O
are	O
usually	O
less	O
widely	O
compatible	B-Device
.	O
</s>
<s>
The	O
DOC	B-Operating_System
files	I-Operating_System
created	O
with	O
Microsoft	O
Word	O
versions	O
differ	O
.	O
</s>
<s>
In	O
Microsoft	O
Word	O
2007	O
and	O
later	O
,	O
the	O
binary	O
file	O
format	O
was	O
replaced	O
as	O
the	O
default	O
format	O
by	O
the	O
Office	B-Operating_System
Open	I-Operating_System
XML	I-Operating_System
format	O
,	O
though	O
Microsoft	O
Word	O
can	O
still	O
produce	O
DOC	B-Operating_System
files	I-Operating_System
.	O
</s>
<s>
The	O
DOC	B-Operating_System
format	O
is	O
native	O
to	O
Microsoft	O
Word	O
.	O
</s>
<s>
Other	O
word	B-General_Concept
processors	I-General_Concept
,	O
such	O
as	O
OpenOffice.org	B-Application
Writer	I-Application
,	O
IBM	B-Operating_System
Lotus	I-Operating_System
Symphony	I-Operating_System
,	O
Apple	B-Application
Pages	I-Application
and	O
AbiWord	B-Language
,	O
can	O
also	O
create	O
and	O
read	O
DOC	B-Operating_System
files	I-Operating_System
,	O
although	O
with	O
some	O
limitations	O
.	O
</s>
<s>
Command	B-Application
line	I-Application
programs	O
for	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
that	O
can	O
convert	O
files	O
from	O
the	O
DOC	B-Operating_System
format	O
to	O
plain	O
text	O
or	O
other	O
standard	O
formats	O
include	O
the	O
wv	B-Operating_System
library	O
,	O
which	O
itself	O
is	O
used	O
directly	O
by	O
AbiWord	B-Language
.	O
</s>
<s>
Because	O
the	O
DOC	B-Operating_System
file	I-Operating_System
format	O
was	O
a	O
closed	O
specification	O
for	O
many	O
years	O
,	O
inconsistent	O
handling	O
of	O
the	O
format	O
persists	O
and	O
may	O
cause	O
some	O
loss	O
of	O
formatting	O
information	O
when	O
handling	O
the	O
same	O
file	O
with	O
multiple	O
word	B-General_Concept
processing	I-General_Concept
programs	O
.	O
</s>
<s>
The	O
DOC	B-Operating_System
format	O
specification	O
was	O
available	O
from	O
Microsoft	O
on	O
request	O
since	O
2006	O
under	O
restrictive	O
RAND-Z	O
terms	O
until	O
February	O
2008	O
.	O
</s>
<s>
Sun	O
Microsystems	O
and	O
OpenOffice.org	B-Application
reverse	O
engineered	O
the	O
file	O
format	O
.	O
</s>
<s>
On	O
February	O
15	O
,	O
2008	O
,	O
Microsoft	O
released	O
a	O
.DOC	B-Operating_System
format	O
specification	O
under	O
the	O
Microsoft	O
Open	O
Specification	O
Promise	O
.	O
</s>
<s>
However	O
,	O
this	O
specification	O
does	O
not	O
describe	O
all	O
of	O
the	O
features	O
used	O
by	O
DOC	B-Operating_System
format	O
and	O
reverse	O
engineered	O
work	O
remains	O
necessary	O
.	O
</s>
<s>
The	O
format	O
used	O
in	O
earlier	O
,	O
pre-97	O
(	O
"	O
1.0	O
"	O
1989	O
through	O
"	O
7.0	O
"	O
1995	O
)	O
versions	O
of	O
Word	O
are	O
less	O
known	O
,	O
but	O
both	O
OpenOffice	B-Application
and	O
LibreOffice	O
contain	O
open-source	O
code	O
for	O
reading	O
these	O
formats	O
.	O
</s>
<s>
Some	O
historical	O
documentations	O
may	O
use	O
the	O
DOC	B-Operating_System
filename	O
extension	O
for	O
plain-text	O
files	O
,	O
indicating	O
documentation	O
for	O
software	O
or	O
hardware	O
.	O
</s>
<s>
The	O
DOC	B-Operating_System
filename	O
extension	O
was	O
also	O
used	O
during	O
the	O
1980s	O
by	O
WordPerfect	B-Application
for	O
its	O
proprietary	O
format	O
.	O
</s>
<s>
DOC	B-Operating_System
is	O
sometimes	O
used	O
by	O
users	O
of	O
Palm	B-Operating_System
OS	I-Operating_System
as	O
shorthand	O
for	O
PalmDoc	O
,	O
an	O
unrelated	O
format	O
(	O
commonly	O
using	O
PDB	O
filename	O
extension	O
)	O
used	O
to	O
encode	O
text	O
files	O
such	O
as	O
ebooks	O
.	O
</s>
