<s>
XTND	B-Application
was	O
a	O
document	O
import/export	O
system	O
developed	O
by	O
Claris	O
for	O
their	O
products	O
on	O
the	O
Apple	B-Device
Macintosh	I-Device
.	O
</s>
<s>
Products	O
supporting	O
XTND	B-Application
placed	O
an	O
additional	O
popup	O
menu	O
in	O
the	O
open	O
and	O
save	O
dialogs	O
,	O
allowing	O
users	O
to	O
read	O
and	O
write	O
documents	O
of	O
any	O
supported	O
format	O
.	O
</s>
<s>
The	O
name	O
is	O
a	O
four-letter	O
contraction	O
of	O
extend	O
,	O
the	O
Mac	B-Device
using	O
four-letter	O
identifiers	O
in	O
its	O
system	B-Operating_System
resource	I-Operating_System
files	O
.	O
</s>
<s>
XTND	B-Application
was	O
first	O
introduced	O
in	O
1989	O
with	O
MacWrite	B-Operating_System
II	I-Operating_System
,	O
Claris	O
CAD	O
2.0	O
and	O
with	O
FileMaker	B-Application
Pro	I-Application
in	O
1991	O
.	O
</s>
<s>
In	O
1992	O
Claris	O
gave	O
the	O
system	O
to	O
Apple	O
,	O
who	O
eventually	O
re-branded	O
it	O
as	O
a	O
basic	O
part	O
of	O
the	O
Mac	B-Device
OS	O
known	O
as	O
the	O
Translation	O
Manager	O
.	O
</s>
<s>
They	O
also	O
added	O
Macintosh	B-Device
Easy	O
Open	O
which	O
offered	O
to	O
open	O
unknown	O
documents	O
using	O
software	O
installed	O
on	O
the	O
machine	O
and	O
converting	O
it	O
using	O
XTND	B-Application
.	O
</s>
<s>
A	O
developer	O
's	O
guide	O
,	O
XTND	B-Application
Programmer	O
's	O
Guide	O
,	O
was	O
published	O
in	O
1991	O
along	O
with	O
the	O
XTND	B-Application
Developer	O
's	O
Kit	O
1.3	O
,	O
which	O
was	O
placed	O
on	O
their	O
FTP	B-Protocol
site	O
.	O
</s>
<s>
XTND	B-Application
broke	O
on	O
the	O
Power	B-Device
Macs	I-Device
,	O
but	O
an	O
extension-to-the-extension	O
released	O
in	O
1993	O
fixed	O
that	O
for	O
a	O
time	O
.	O
</s>
<s>
XTND	B-Application
consisted	O
of	O
a	O
simple	O
runtime	O
engine	O
that	O
listed	O
,	O
loaded	O
and	O
managed	O
a	O
series	O
of	O
"	O
translators	O
"	O
.	O
</s>
<s>
The	O
translators	O
were	O
stored	O
in	O
resource	O
files	O
placed	O
in	O
the	O
Mac	B-Device
's	O
System	O
folder	O
,	O
allowing	O
them	O
to	O
be	O
found	O
and	O
used	O
by	O
any	O
program	O
supporting	O
the	O
XTND	B-Application
system	O
.	O
</s>
<s>
Claris	O
supplied	O
translators	O
for	O
word-processors	O
like	O
MacWrite	B-Operating_System
,	O
Microsoft	B-Application
Word	I-Application
,	O
AppleWorks	B-Device
,	O
AppleWorks	B-Device
GS	O
,	O
WriteNow	B-Operating_System
,	O
WordPerfect	B-Application
,	O
WordStar	B-Application
,	O
as	O
well	O
as	O
translators	O
for	O
various	O
spreadsheets	O
,	O
graphics	O
and	O
databases	O
formats	O
.	O
</s>
<s>
A	O
major	O
technical	O
problem	O
with	O
XTND	B-Application
was	O
that	O
the	O
conversion	O
process	O
was	O
"	O
opaque	O
"	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
Microsoft	B-Application
Word	I-Application
extension	O
was	O
particularly	O
prone	O
to	O
errors	O
.	O
</s>
