Today I ran some tests because customers have reported some odd problems.
I updated a Windows 10 computer to all the latest updates and finally got to
see what the customer reported.
https://s3.amazonaws.com/uploads.hipchat.com/15697/60882/WN2lcXUa8zdne6o/cor
ruptsignature1.png

"Windows protected your PC
Windows SmartScreen prevented an unrecognized app from starting. Running
this app might put your PC at risk."

Clicking on the more info link allows a customer to run the exe anyway. 

It also appears this only happens with a SHA-1 certificate signed exe, which
was signed after 1/1/2016 that was downloaded from the internet.

The customer can "Unblock" the file, and this problem goes away. 

If you support Windows XP, Vista, or Server 2008 (not R2) you won't see this
problem. You will see this problem on newer OS's. 

If you only sign your EXE with the SHA-2 certificate, it will not work on
Windows XP SP3, Vista, and Server 2008 (according to Microsoft). I still
need to get the SHA-2 certificate.

According to this site:
http://social.technet.microsoft.com/wiki/contents/articles/32288.windows-enf
orcement-of-authenticode-code-signing-and-timestamping.aspx the exe can be
dual signed. I don't know if this process will break the VFP executables. 

If you are looking for code signing, here's a really good deal. 
http://codesigning.ksoftware.net/




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