<s>
Dolphin	B-Application
is	O
a	O
free	O
and	O
open	B-Application
source	I-Application
file	B-Application
manager	I-Application
included	O
in	O
the	O
KDE	B-Language
Applications	I-Language
bundle	O
.	O
</s>
<s>
Dolphin	B-Application
became	O
the	O
default	O
file	B-Application
manager	I-Application
of	O
the	O
KDE	B-Language
Plasma	I-Language
desktop	I-Language
environments	O
in	O
the	O
fourth	B-Language
iteration	I-Language
,	O
termed	O
KDE	B-Language
Software	I-Language
Compilation	I-Language
4	I-Language
.	O
</s>
<s>
It	O
can	O
also	O
be	O
optionally	O
installed	O
on	O
K	B-Language
Desktop	I-Language
Environment	I-Language
3	I-Language
.	O
</s>
<s>
It	O
replaces	O
Konqueror	B-Application
as	O
the	O
default	O
file	B-Application
manager	I-Application
for	O
KDE	B-Language
SC	I-Language
4	I-Language
,	O
but	O
Konqueror	B-Application
can	O
still	O
be	O
used	O
as	O
an	O
alternative	O
file	B-Application
manager	I-Application
.	O
</s>
<s>
Under	O
previous	O
K	B-Application
Desktop	I-Application
Environment	I-Application
versions	O
,	O
Konqueror	B-Application
had	O
served	O
both	O
as	O
the	O
default	O
file	B-Application
manager	I-Application
and	O
web	O
browser	O
.	O
</s>
<s>
However	O
,	O
for	O
many	O
years	O
users	O
have	O
been	O
critical	O
of	O
Konqueror	B-Application
as	O
being	O
too	O
complex	O
for	O
simple	O
file	O
navigation	O
.	O
</s>
<s>
Under	O
KDE	B-Language
SC	I-Language
4	I-Language
,	O
Dolphin	B-Application
was	O
streamlined	O
for	O
browsing	O
files	O
,	O
while	O
sharing	O
as	O
much	O
code	O
as	O
possible	O
with	O
Konqueror	B-Application
.	O
</s>
<s>
Konqueror	B-Application
continues	O
to	O
be	O
developed	O
primarily	O
as	O
a	O
web	O
browser	O
.	O
</s>
<s>
In	O
2014	O
,	O
work	O
started	O
on	O
porting	O
Dolphin	B-Application
to	O
KDE	B-Language
Frameworks	I-Language
5	I-Language
.	O
</s>
<s>
This	O
is	O
now	O
complete	O
and	O
a	O
Frameworks	O
5-based	O
version	O
was	O
released	O
as	O
part	O
of	O
KDE	B-Language
Applications	I-Language
15.08	O
in	O
August	O
2015	O
.	O
</s>
<s>
As	O
development	O
of	O
the	O
KDE	B-Language
SC	I-Language
4	I-Language
version	O
was	O
underway	O
,	O
the	O
K	B-Language
Desktop	I-Language
Environment	I-Language
3	I-Language
version	O
of	O
Dolphin	B-Application
was	O
discontinued	O
.	O
</s>
<s>
However	O
,	O
the	O
program	O
continues	O
to	O
be	O
unofficially	O
available	O
for	O
K	B-Language
Desktop	I-Language
Environment	I-Language
3	I-Language
under	O
the	O
slightly	O
modified	O
name	O
of	O
“	O
D3lphin	B-Application
”	O
.	O
</s>
<s>
D3lphin	B-Application
contains	O
many	O
bugfixes	O
and	O
a	O
new	O
sidebar	O
and	O
is	O
maintained	O
by	O
the	O
TDE	B-Application
project	O
.	O
</s>
