So I followed your sample for creating and downloading a zip file from a button click and I have got it presenting me with a zip file and I cn download it. Unfortunately I am only able to open this with 7Zip and not Windows Compressed Folders. I
know my client is going to want to open it with Compressed Folders.
I've looked at the compression level and methods and tried various options, but no joy.
The files in my zip file seem ok as I can extract them with 7zip and open them.
Just wondering what I am doing wrong?