<s>
The	B-Application
Unarchiver	I-Application
is	O
a	O
proprietary	B-License
freeware	I-License
data	B-General_Concept
decompression	I-General_Concept
utility	O
,	O
which	O
supports	O
more	O
formats	O
than	O
Archive	O
Utility	O
(	O
formerly	O
known	O
as	O
BOMArchiveHelper	O
)	O
,	O
the	O
built-in	O
archive	O
unpacker	O
program	O
in	O
macOS	B-Application
.	O
</s>
<s>
It	O
can	O
also	O
handle	O
filenames	O
in	O
various	O
character	B-General_Concept
encodings	I-General_Concept
,	O
created	O
using	O
operating	B-General_Concept
system	I-General_Concept
versions	O
that	O
use	O
those	O
character	B-General_Concept
encodings	I-General_Concept
.	O
</s>
<s>
The	O
latest	O
version	O
requires	O
Mac	B-Application
OS	I-Application
X	O
Lion	O
or	O
higher	O
.	O
</s>
<s>
The	B-Application
Unarchiver	I-Application
does	O
not	O
compress	O
files	O
.	O
</s>
<s>
The	O
corresponding	O
command	O
line	O
utilities	O
unar	O
and	O
lsar	O
is	O
free	B-Application
software	I-Application
licensed	O
under	O
the	O
LGPL	B-Application
run	O
on	O
Microsoft	B-Application
Windows	I-Application
,	O
Linux	B-Application
,	O
and	O
macOS	B-Application
.	O
</s>
<s>
A	O
main	O
feature	O
of	O
the	B-Application
Unarchiver	I-Application
is	O
its	O
ability	O
to	O
handle	O
many	O
old	O
or	O
obscure	O
formats	O
like	O
StuffIt	B-Application
as	O
well	O
as	O
AmigaOS	B-Application
disk	O
images	O
and	O
LZH	O
/	O
LZX	O
archives	O
,	O
and	O
so	O
on	O
.	O
</s>
<s>
This	O
is	O
credited	O
in	O
its	O
source	O
code	O
to	O
the	O
use	O
of	O
libxad	B-Application
,	O
an	O
Amiga	O
file	O
format	O
library	O
.	O
</s>
<s>
Ågren	O
also	O
worked	O
to	O
reverse	O
engineer	O
the	O
StuffIt	B-Application
and	O
StuffIt	B-Application
X	I-Application
formats	O
,	O
and	O
his	O
code	O
was	O
one	O
of	O
the	O
most	O
complete	O
open	O
source	O
implementations	O
of	O
these	O
proprietary	O
formats	O
.	O
</s>
