Error message when opening Diamonds:
Cannot open the Microsoft Jet engine workgroup information file
Is it not longer possible to use Diamonds.
Solution
This error is due to an update of the Kaspersky Lab antivirus on April 9th, 2014. A more recent update of the antivirus software should fix the problem.
You could also fix it manually by temporarily disabling the Kaspersky antivirus software. Moreover, disabling the ‘System Watch’ should be sufficient. You should also delete the file system.mdb (0 bytes) in the Diamonds installation folder.
More information can be found here: http://forum.kaspersky.com/lofiversion/index.php/t292998.html
