Although KVIrc removes some QT entries, there's a couple that are missed:
Qt Factory Cache 4.8\com.trolltech.qt.QIconEngineFactoryInterface:
Qt Factory Cache 4.8\com.trolltech.qt.QIconEngineFactoryInterfaceV2:
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[Fixed] KVIrc doesn't remove all Qt entries
      June 26, 2013 - 9:07pm
                
    
    
        
    #1
  
          [Fixed] KVIrc doesn't remove all Qt entries        
      
       
       
  
 
        
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This is fixed in KVIrc Portable 4.2.0 Rev 3.
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