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Mandodari RawatMandodari Rawat 

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

 
Best Answer chosen by Mandodari Rawat
Mandodari RawatMandodari Rawat
This is not question... it is just information in case if you see the same issue while running SOQL in Query Editor.