<s>
In	O
computing	O
,	O
Envoy	B-Application
was	O
a	O
proprietary	O
portable	B-Application
document	I-Application
file	I-Application
format	O
marketed	O
by	O
WordPerfect	B-Application
Corporation	I-Application
,	O
created	O
as	O
a	O
competitor	O
for	O
Acrobat	B-Application
Pro	I-Application
.	O
</s>
<s>
It	O
was	O
introduced	O
by	O
Tumbleweed	O
Communications	O
Corporation	O
in	O
1993	O
and	O
shipped	O
with	O
WordPerfect	B-Application
Office	O
in	O
March	O
1994	O
.	O
</s>
<s>
An	O
Envoy	B-Application
file	O
could	O
be	O
created	O
by	O
the	O
use	O
of	O
a	O
special	O
printer	B-Application
driver	I-Application
in	O
WordPerfect	B-Application
,	O
and	O
an	O
application	O
for	O
"	O
viewing	O
,	O
manipulating	O
,	O
annotating	O
or	O
printing	O
Envoy	B-Application
files	O
"	O
was	O
included	O
in	O
the	O
WordPerfect	B-Application
Envoy	B-Application
product	O
,	O
together	O
with	O
a	O
"	O
runtime	O
file	O
"	O
that	O
permitted	O
the	O
a	O
viewer	O
to	O
be	O
embedded	O
in	O
Envoy	B-Application
files	O
and	O
enable	O
recipients	O
to	O
have	O
"	O
all	O
the	O
functionality	O
of	O
the	O
full	O
viewer	O
without	O
paying	O
licensing	O
charges	O
"	O
.	O
</s>
<s>
The	O
resulting	O
document	O
could	O
be	O
viewed	O
in	O
a	O
separate	O
viewer	O
application	O
,	O
the	O
Envoy	B-Application
Distributable	I-Application
Viewer	I-Application
,	O
which	O
also	O
worked	O
as	O
a	O
web	B-Application
browser	I-Application
plugin	B-Application
.	O
</s>
<s>
Unlike	O
Adobe	B-Application
PDF	I-Application
,	O
the	O
file	O
format	O
was	O
not	O
publicly	O
documented	O
.	O
</s>
<s>
Envoy	B-Application
failed	O
to	O
make	O
any	O
headway	O
against	O
PDF	B-Application
,	O
and	O
is	O
largely	O
now	O
unused	O
.	O
</s>
<s>
Some	O
have	O
reported	O
success	O
in	O
reading	O
Envoy	B-Application
documents	O
by	O
printing	O
to	O
PostScript	B-Language
from	O
the	O
Envoy	B-Application
Distributable	I-Application
Viewer	I-Application
,	O
then	O
converting	O
the	O
PostScript	B-Language
file	O
to	O
a	O
PDF	B-Application
.	O
</s>
<s>
The	O
PostScript	B-Language
file	O
can	O
also	O
be	O
viewed	O
directly	O
using	O
a	O
viewer	O
such	O
as	O
Ghostscript	B-Language
.	O
</s>
