Dependency dll dot

Dependent dll and other files for distributing Dot.exe

I want to distribute dot.exe with my software without including the entire graphviz package which is 153mb.  I was wondering if anyone has done that and what are the .dll files and other files required by dot.exe? 
I have tried to just include dot.exe, and gradually add .dll file that it complained missing when running a simple dot command. But at the end, it gave the error that png file format is not recognized without giving hints of what files it needs. I was using dot.exe -Tpng xx.dot -O.
I would appreciate any help or hints on this issue.

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