Hello,
If the ten years question paper file is not opening, it may be due to file corruption, unsupported format or incomplete download. Try downloading the file again and make sure the download completes fully. Check if your device has an updated PDF reader or file viewer. If the file still does not open, try using another device to check whether the file is working. If none of these methods help, you should request a fresh copy of the question paper file.
Hope this helps you.