How to convert png from iPod Touch to Windows png
Step 1) Download this file:
After the download is done you can extract the archive by using winrar or your preferred rar decompressor.
Extract the folder from the rar.
You should have a directory named fixpngWindows in front of you.
Copy and paste the files you would like to convert into the "png" subdirectory.
Now simply run iPhoneFixPng.exe and press convert
If all went well your new, readable, png's should be in the "fixed" subdirectory!