Index: Common.h
===================================================================
diff -u -r4c8f5e8c8e26bb5c84859b4c846f3b583aae55fe -r87837a30c01ccd74d05bb77c734cbbc25a045202
--- Common.h	(.../Common.h)	(revision 4c8f5e8c8e26bb5c84859b4c846f3b583aae55fe)
+++ Common.h	(.../Common.h)	(revision 87837a30c01ccd74d05bb77c734cbbc25a045202)
@@ -34,7 +34,7 @@
 
 typedef float                    F32;               ///< 32-bit floating point type
 typedef double                   F64;               ///< 64-bit floating point type
-typedef unsigned long long       U64;               ///< 64-bit unsigned integer type
+typedef long long                S64;               ///< 64-bit signed integer type
 typedef unsigned int             U32;               ///< 32-bit unsigned integer type
 typedef int                      S32;               ///< 32-bit signed integer type
 typedef unsigned short           U16;               ///< 16-bit unsigned integer type