Laurindo,
if you're question is about what the Technics files do/mean
it's mostly something like this:

.cmp = Composer data
.seq /.sqt = Sequenser data
.sqf = Sound data
.lsw / .pmt = Panel memory data
.tm = Sound memory data
.msp = Panel sequense pads

Wich of the files who are in use depend of what KN model they are
used/saved on.
The .pmt and .sqt is not present before the KN5000,and there are
some new at the KN6000 and 6500 like .ast and .est that I don't
know much about yet.
There will be a new "Technical corner" page at my website in short
time who hopefully will explain this issues.

Regards

GJ