<s>
The	O
.PK2	O
file	O
extension	O
is	O
used	O
by	O
Silkroad	B-Protocol
Online	I-Protocol
,	O
a	O
MMORPG	B-Protocol
developed	O
by	O
.	O
</s>
<s>
The	O
.pk2	O
file	O
extension	O
is	O
used	O
primarily	O
for	O
video	O
games	O
and	O
CD+G	O
Karaoke	O
Files	O
.	O
</s>
<s>
The	O
CAD	O
file	O
format	O
used	O
by	O
Creo	O
Elements	O
/	O
Direct	O
Modeling	O
Express	O
uses	O
a	O
.pk2	O
extension	O
.	O
</s>
<s>
The	O
.pk2	O
files	O
can	O
not	O
be	O
read	O
by	O
the	O
paid	O
version	O
of	O
Creo	O
Elements	O
/	O
Direct	O
Modeling	O
.	O
</s>
