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sObject type 'XXXX__c' is not supported.
Please uncheck the 'Use Tooling API' Checkbox in Query Editor whenever you see sObject type 'XXXX__c' is not supported error while running SOQL.
It is just after 'Execute' button. Please see the snapshot below:
![sObject Type XXXX__C is not supported](/forums/servlet/rtaImage?eid=906F0000000MLo0&feoid=Body&refid=0EMF0000000I5hO)
It is just after 'Execute' button. Please see the snapshot below:
![](/forums/img/s.gif)
This is not question... it is just information in case if you see the same issue while running SOQL in Query Editor.