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NullReferenceException when selecting Tools - Options

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Observed with Changeset 16545 version (built from source myself).
When opening the Options form I get a NullReferenceException. Reason: In utils.cs, line 201ff a registry subkey named "shell" is opened:
 
RegistryKey programKey = Registry.ClassesRoot.OpenSubKey(programValue + "\shell");
string defaultAction = (string)programKey.GetValue("", null);
 
On my system subkey "shell" key does not exist and therefore variable programKey is null.

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