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what are .9.png

It appears it's a ninepatch graphic format.

It's an Android class i.e. NinePatch(), that you can draw a bitmap in nine sections with.

Look it up in the Android SDK.

There's a format called .apng, which is like gif, in that it supports animation, and uses .png files for it.
 
.9.pngs are like regular .png files.

The difference is that when properly set up, they can be "stretched". That is, a 10x10 image can be used to fill a 10x80px space a 30x35px space or another other dimension that you can need it to fill.

They do NOT edit like regular .pngs though.
 
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