Problem with Pokemon Platinum

Hy Community
This is my first topic, I do not know on here is correct ^^.
My little brother plays Pokemin Platinum with the Nogba 2.6a Emulator.
He have a big problem, when he save his Game, the Emulator did not save it.
The Game means "Save Complete", but in the Battery folder, there is no .sav Data.
I thought, the Savetyp is wrong, witch savetyp does Pokemon Platinum use?The Second problem is, the Windows from the Nogba 2.6a is very small.
He installed a Program called: NDS2xGl2.
The Windows is bigger, but not big enough.
He have Problem with his eyes, so he need a big Windows.
Is there a possibility, to make it Fullscreen?, the NDS2xGl2 have a Fullscreen Option, but this Option didn't works.
Soory for my bad english, i com from Germany ^^Thanks to all ReplysIlliminator31

Check out the Common Issues thread.
https://www.romulation.org/forum/index.php?topic=1462.0Download No$Zoomer, you can increase the screen size quite a bit. It should also fix your save issue.

Ok Thanks.
I check it today eavening, i have to go to school ^^Illiminator31