"The publisher could not be verified" warning opening .exe files
"The publisher could not be verified. Are you sure you want to run this software".
To get rid of this error:
Start > Run > gpedit.msc
User Configuration > Administrative Templates > Windows Components > Attachment Manager
Add .exe to "Inclusion list for moderate risk file types"
Alternatively, if file is opened from a network location you can add this network location to Internet Explorer Local/Trusted sites category.