We have an adobe air application which has a code signing certificate included during creation of the package. I added another layer by creating a windows installer(via Inno Setup) then using microsoft signtool to pass on the code signing certificate. I recently tried to download the file via Chrome and the message:
<file> is not commonly downloaded and could be dangerous
was displayed along the lines of the image below:
I took my exe file and applied the adobe code signing certificate to this windows installer wrapped package using the Certificate Utility. Voila! The error message was no longer occurring when downloading via Chrome.