use smart combobox control

CUETools.Compression.Rar/CUETools.Compression.Rar.csproj

@@ -31,6 +31,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />

CUETools.Processor/Processor.cs

@@ -583,6 +583,13 @@ namespace CUETools.Processor
 			encoderLossy = _encoderLossy;
 			decoder = _decoder;
 		}
+		public string DotExtension
+		{
+			get
+			{
+				return "." + extension;
+			}
+		}
 		public override string ToString()
 		{
 			return extension;