<s>
XPostFacto	B-Application
is	O
an	O
open	B-Application
source	I-Application
utility	O
that	O
enables	O
the	O
installation	O
of	O
PowerPC	B-Architecture
versions	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
up	O
to	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
(	O
Tiger	O
)	O
,	O
and	O
Darwin	B-Operating_System
on	O
some	O
PowerPC-based	O
Apple	B-Device
Macintosh	I-Device
systems	O
that	O
are	O
not	O
officially	O
supported	O
for	O
them	O
by	O
Apple	O
.	O
</s>
