Dolffin can't import PNG file

Sir , i have a question again .
First, i can't open xxxxcrt.fsh (example . lalacrt.fsh) with FSHx .

So , i try to open it with wDOLFFIN , it's can open lalacrt.fsh
but when i try to import image to lalacrt.fsh in tlga, the image is didn't change.
Anyone have a solution ?
*I use windows 7.

Make sure that the png file is the same size(256x256) as the tlga file when you import it with Dolffin.

Make sure that the png file is the same size(256x256) as the tlga file when you import it with Dolffin.

yes i have done with size but still same

I do not know what else to suggest.