diff --git a/InstallShieldCabinet/Constants.cs b/InstallShieldCabinet/Constants.cs
index 8ba1565..72221ee 100644
--- a/InstallShieldCabinet/Constants.cs
+++ b/InstallShieldCabinet/Constants.cs
@@ -8,10 +8,14 @@ namespace SabreTools.Models.InstallShieldCabinet
 
         public const uint SignatureUInt32 = 0x28635349;
 
+        public const string HEADER_SUFFIX = "hdr";
+
+        public const string CABINET_SUFFIX = "cab";
+
         public const int COMMON_HEADER_SIZE = 20;
 
         public const int VOLUME_HEADER_SIZE_V5 = 40;
-        
+
         public const int VOLUME_HEADER_SIZE_V6 = 64;
 
         // TODO: Determine how the value "71" was chosen here