c# does not support the .zip64
extension.
how large is your zip file because if it under 4GiB rename it to .zip and it should work fine if it is larger than that see this
http://dotnetzip.codeplex.com/
To change the file extension
- Open windows explorer and press Alt + V
- Then go to tools and then folder options and make sure that the hide extensions for known file types box is unchecked and click apply and ok.
- then simply rename the file to remove the
64
from the extension so it is just.zip
- Then Click yes on the prompt
- And then you should be able to open the file in your program
hope this helps