1 files changed, 14 insertions, 0 deletions

diff --git a/src/WixToolset.BootstrapperCore.Native/inc/BootstrapperEngine.h b/src/WixToolset.BootstrapperCore.Native/inc/BootstrapperEngine.h
index a6a87622..13229c29 100644
--- a/src/WixToolset.BootstrapperCore.Native/inc/BootstrapperEngine.h
+++ b/src/WixToolset.BootstrapperCore.Native/inc/BootstrapperEngine.h
@@ -124,6 +124,7 @@ enum BOOTSTRAPPER_ENGINE_MESSAGE
     BOOTSTRAPPER_ENGINE_MESSAGE_APPLY,
     BOOTSTRAPPER_ENGINE_MESSAGE_QUIT,
     BOOTSTRAPPER_ENGINE_MESSAGE_LAUNCHAPPROVEDEXE,
+    BOOTSTRAPPER_ENGINE_MESSAGE_COMPAREVERSIONS,
 };
 
 typedef struct _BAENGINE_APPLY_ARGS
@@ -147,6 +148,19 @@ typedef struct _BAENGINE_CLOSESPLASHSCREEN_RESULTS
     DWORD cbSize;
 } BAENGINE_CLOSESPLASHSCREEN_RESULTS;
 
+typedef struct _BAENGINE_COMPAREVERSIONS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVersion1;
+    LPCWSTR wzVersion2;
+} BAENGINE_COMPAREVERSIONS_ARGS;
+
+typedef struct _BAENGINE_COMPAREVERSIONS_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+} BAENGINE_COMPAREVERSIONS_RESULTS;
+
 typedef struct _BAENGINE_DETECT_ARGS
 {
     DWORD cbSize;