Back in Thursday, November 19, 2015, I showed a bit if html that can be used as a redirector for custom URL handlers. Since then Microsoft has hardened their products a bit and an extra step is needed.
Create the content as shown in Sharepoint Redirect to Notes://.
Save the file, with the content shown in the post, with the extension as .http
Test it by double click the file. IT should open a browser tab and automatically launch the application as expected.
Copy the .http file, then change the extension to .aspx.
You typically cannot test this until it's used from a Sharepoint site.
Save the file on your Sharepoint site.
Test this by clicking on the file you just saved, it should behave as the redirector and open your application.
Get the URL to the .aspx file.
Test this by trying the URL in the address bar of a new browser tab or window, it should behave as the redirector and open your application.
On the Sharepoint page, modify the link to use the working URL acquired in the last step.
Test this by lots of happy clicks! : )
You're done!
