This works real well for
Rocketdock because Rocketdock uses PNG images for it's icons. Rocketdock is a free docking setup for Windows.You can also download the free
JPEG to ICON software that supports PNG also.Then convert it to ico format if you wish.
I downloaded and installed Synfig Studio earlier today to find it still didn't include a desktop icon.
So i found a somewhat clear image of their logo and opened it in Inkscape and created my own.
I posted it here so you guys can use it if you want to.
Here is what it looks like in the dock (mine anyway).
The image itself
Sorry i messed up on the bottom left corner a bit.I decided it was good enough though because you really can not tell when it's smaller. That and i am lazy.