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I was looking to donload the manual for this aircraft. Under the files Tab here https://hobbyking.com/en_us/durafly-tundra-1300mm-51-sports-model-w-flaps-pnf-upgrade-version.html?wrh_pdp=3 is a file which may be a manual but with a .gtk file extension. Google presented me with a mystery when I asked it to tell me how to open a file with this extension. Can someone please give me a link to the manual in a format that can be read with normal PC software please?