I read in the development documentation appicon.ico should contain the following 16px (8-bit), 32px (8-bit), 48px (8-bit), 16px (32-bit), 32px (32-bit), 48px (32-bit) and, optionally, 256px (32-bit). What about 20px and 24px icons? Can we include that formats too or we can't?
Yes, additional icons are fine.
They will increase the file size, so best not to include them. But there should be no problem if you do include them, they will just be ignored.
Thank you for the quick reply.