<s>
The	O
.LBR	B-Application
file	O
format	O
was	O
an	O
archive	B-General_Concept
file	I-General_Concept
format	I-General_Concept
invented	O
by	O
Gary	O
P	O
.	O
Novosielski	O
used	O
on	O
CP/M	B-Application
and	O
DOS	B-Device
operating	O
systems	O
during	O
the	O
early	O
1980s	O
.	O
</s>
<s>
Packages	O
in	O
.LBR	B-Application
format	O
were	O
created	O
by	O
the	O
LU	O
program	O
.	O
</s>
<s>
It	O
can	O
act	O
in	O
interactive	O
and	O
parameter-driven	O
mode	O
,	O
and	O
can	O
add	O
,	O
extract	O
,	O
delete	O
files	O
from	O
the	O
LBR	B-Application
package	O
.	O
</s>
<s>
Later	O
compatible	O
programs	O
like	O
NULU	O
arrived	O
for	O
.LBR	B-Application
creation	O
,	O
and	O
many	O
tools	O
such	O
as	O
LT	O
and	O
QL	O
were	O
capable	O
of	O
extracting	O
from	O
.LBR	B-Application
archives	O
.	O
</s>
<s>
.LBR	B-Application
is	O
an	O
abbreviation	O
of	O
"	O
Library	O
"	O
,	O
and	O
,	O
resembling	O
the	O
.tar	B-Application
file	O
format	O
,	O
member	O
files	O
were	O
only	O
stored	O
in	O
the	O
.LBR	B-Application
file	O
,	O
not	O
compressed	O
.	O
</s>
<s>
As	O
transfer	O
of	O
LBR	B-Application
files	O
by	O
modem	O
was	O
common	O
,	O
it	O
was	O
typical	O
practice	O
for	O
archiving	O
a	O
collection	O
of	O
files	O
to	O
compress	O
them	O
using	O
the	O
SQ	B-Application
or	O
CRUNCH	O
programs	O
then	O
store	O
them	O
in	O
an	O
.LBR	B-Application
archive	O
,	O
or	O
else	O
(	O
more	O
rarely	O
)	O
store	O
the	O
files	O
in	O
the	O
LBR	B-Application
archive	O
,	O
then	O
use	O
SQ	B-Application
or	O
CRUNCH	O
to	O
compress	O
the	O
archive	O
.	O
</s>
<s>
A	O
compressed	O
LBR	B-Application
archive	O
file	O
was	O
given	O
the	O
extension	O
"	O
.LQR	B-Application
"	O
(	O
if	O
squeezed	O
)	O
or	O
"	O
.LZR	O
"	O
(	O
if	O
crunched	O
)	O
;	O
however	O
,	O
it	O
was	O
more	O
common	O
to	O
compress	O
the	O
members	O
of	O
the	O
archive	O
than	O
to	O
compress	O
the	O
archive	O
as	O
a	O
whole	O
.	O
</s>
<s>
As	O
MS-DOS	O
and	O
other	O
operating	O
systems	O
became	O
more	O
popular	O
and	O
displaced	O
CP/M	B-Application
,	O
.LBR	B-Application
'	O
s	O
popularity	O
waned	O
.	O
</s>
<s>
The	O
development	O
of	O
the	O
ARC	B-Application
archiver	O
which	O
both	O
compressed	O
and	O
archived	O
files	O
in	O
one	O
program	O
went	O
a	O
long	O
way	O
towards	O
displacing	O
.LBR	B-Application
on	O
MS-DOS	O
systems	O
;	O
on	O
CP/M	B-Application
systems	O
,	O
.LBR	B-Application
persisted	O
longer	O
due	O
to	O
the	O
lack	O
of	O
a	O
useful	O
ARC	B-Application
port	O
.	O
</s>
