<s>
ACT	O
is	O
a	O
lossy	O
ADPCM	B-Algorithm
8	O
kbit/s	O
compressed	O
audio	O
format	O
recorded	O
by	O
most	O
Chinese	O
MP3	O
and	O
MP4	O
players	O
with	O
a	O
recording	O
function	O
,	O
and	O
voice	O
recorders	O
.	O
</s>
<s>
Devices	O
which	O
record	O
in	O
this	O
format	O
are	O
usually	O
supplied	O
with	O
an	O
ACT	O
to	O
WAV	O
converter	O
program	O
that	O
runs	O
under	O
Microsoft	B-Application
Windows	I-Application
;	O
the	O
converter	O
usually	O
used	O
can	O
be	O
downloaded	O
as	O
part	O
of	O
.	O
</s>
<s>
Linux	O
command-line	O
utility	O
SoX	B-Operating_System
supports	O
.act	O
files	O
.	O
</s>
