However when downloading the file you will probably need to use the Google file conversion option to convert the file to to MSWord, PDF etc to let people open in on their devices.
It looks like the app you are trying to open the PDF with is trying to use the default encoding of your Windows, which is Western European (Windows),
As far as I know Google Docs files are encoded in Unicode (UTF-8)
You can try to select the Other encoding option and find Unicode (UTF-8) in the list or try using a different application like Adobe Acrobat Reader or Foxit PDF reader to open the file.