Prevent Protected View

I have clients that download an excel file from my on-line store and when they see the "Protected View" warning they think something is wrong with the file they received from me.

Is there a way to create an excel 2010 file that when it is downloaded from the Internet that it will not open in Protected View?

There may be another solution, but the only way I know of would be to use a digital certificate, then have the user "Trust this publisher".

I am not an expert on 2010, though. I only just started using it.