<s>
A	O
native	B-Application
format	I-Application
,	O
in	O
the	O
context	O
of	O
software	O
applications	O
,	O
refers	O
to	O
the	O
file	O
format	O
which	O
the	O
application	O
is	O
designed	O
to	O
work	O
with	O
.	O
</s>
<s>
In	O
turn	O
,	O
a	O
foreign	B-Application
format	I-Application
is	O
not	O
a	O
true	O
reflection	O
of	O
application	O
internals	O
,	O
even	O
though	O
it	O
may	O
be	O
supported	O
by	O
an	O
application	O
.	O
</s>
<s>
To	O
read	O
a	O
foreign	O
file	O
causes	O
translation	O
of	O
data	O
,	O
this	O
can	O
cause	O
data	O
loss	O
and	O
further	O
editing	O
may	O
prevent	O
faithful	O
writing	O
back	O
to	O
the	O
foreign	B-Application
format	I-Application
.	O
</s>
<s>
A	O
document	O
writer	O
application	O
may	O
support	O
a	O
multitude	O
of	O
files	O
,	O
ranging	O
from	O
simple	O
text	O
files	O
that	O
only	O
store	O
characters	O
and	O
not	O
font	B-General_Concept
faces	I-General_Concept
or	O
sizes	O
,	O
to	O
complex	O
documents	O
containing	O
text	O
effects	O
and	O
images	O
.	O
</s>
<s>
Instead	O
,	O
the	O
document	O
writer	O
may	O
first	O
convert	B-General_Concept
the	O
file	O
into	O
its	O
own	O
native	O
data	O
structure	O
.	O
</s>
<s>
Once	O
the	O
file	O
is	O
done	O
being	O
edited	O
,	O
the	O
application	O
will	O
then	O
convert	B-General_Concept
the	O
file	O
back	O
to	O
its	O
original	O
format	O
.	O
</s>
<s>
This	O
may	O
be	O
due	O
to	O
licensing	O
issues	O
,	O
or	O
simply	O
because	O
the	O
feature	O
has	O
not	O
been	O
implemented	O
in	O
the	O
application	O
's	O
programming	B-General_Concept
yet	O
.	O
</s>
<s>
However	O
,	O
the	O
application	O
will	O
typically	O
be	O
able	O
to	O
save	O
the	O
document	O
in	O
its	O
own	O
native	B-Application
format	I-Application
or	O
any	O
of	O
the	O
other	O
foreign	B-Application
formats	I-Application
it	O
is	O
programmed	O
to	O
export	O
.	O
</s>
<s>
For	O
example	O
,	O
Microsoft	B-Application
Office	I-Application
Word	I-Application
2003	I-Application
is	O
able	O
to	O
open	O
Windows	B-Application
Write	I-Application
( *	O
.wri	B-Application
)	O
files	O
,	O
but	O
cannot	O
save	O
them	O
.	O
</s>
