<s>
PC	B-Operating_System
Exchange	I-Operating_System
was	O
a	O
utility	B-Application
program	I-Application
for	O
Apple	B-Device
Macintosh	I-Device
computers	I-Device
.	O
</s>
<s>
It	O
was	O
a	O
control	B-Operating_System
panel	I-Operating_System
for	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
that	O
lets	O
the	O
operating	B-General_Concept
system	I-General_Concept
mount	O
FAT	B-Application
file	I-Application
systems	I-Application
and	O
mapped	O
file	O
extensions	O
to	O
the	O
user-defined	O
type	O
and	O
creator	B-Operating_System
codes	I-Operating_System
.	O
</s>
<s>
It	O
was	O
first	O
made	O
available	O
in	O
1992	O
as	O
a	O
commercial	B-Application
software	I-Application
product	O
from	O
Apple	O
,	O
but	O
in	O
1993	O
,	O
it	O
was	O
no	O
longer	O
a	O
commercial	O
product	O
on	O
its	O
own	O
,	O
and	O
shipped	O
with	O
System	B-Operating_System
7	I-Operating_System
Pro	I-Operating_System
as	O
part	O
of	O
Apple	O
's	O
push	O
to	O
become	O
more	O
compatible	O
with	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
It	O
worked	O
transparently	O
,	O
mounting	O
the	O
disks	O
on	O
the	O
desktop	O
as	O
if	O
they	O
were	O
normal	O
Mac	B-Device
disks	O
,	O
with	O
the	O
exception	O
of	O
the	O
large	O
letters	O
PC	O
on	O
the	O
icon	O
which	O
were	O
visually	O
similar	O
to	O
the	O
IBM	O
logotype	O
.	O
</s>
<s>
Originally	O
only	O
floppy	B-Device
disks	I-Device
were	O
supported	O
,	O
but	O
later	O
versions	O
added	O
support	O
for	O
hard	O
drives	O
,	O
CD-ROMs	O
and	O
other	O
types	O
of	O
media	O
.	O
</s>
<s>
PC	B-Operating_System
Exchange	I-Operating_System
is	O
not	O
used	O
in	O
macOS	B-Application
,	O
which	O
uses	O
a	O
completely	O
different	O
driver	O
architecture	O
to	O
read	O
the	O
FAT	B-Application
file	I-Application
system	I-Application
.	O
</s>
