Need CS3 to open PNG files


i have large image portfolio files in png , need edit cs3 not open them. sends error message saying not recognize file. there anywhere can set so? preferences did not seem have anything. have plug-in. on mac os 10. 

where png files created?

are sure files have correct suffices , in fact pngs?

could post one? (i not have photoshop cs3 installed not verify issue, else might.)

 

i on mac os 10.

could please state exact os version? (edited)



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