Code Signing errors when Dual Signing SHA-1 and SHA-256 for Legacy Systems including Windows XP SP3

PROBLEM: Unable to validate Digital Signature on Windows XP SP3 I recently encountered the following errors when attempting to validate the Digital Signatures for our application on Windows XP SP3: Digital Code Signature (Right-click application > Properties > Digital Signatures > Details) Digital Signature Information The certificate is not valid for the requested usage. Certificate Information […]