diff --git a/dlls/msi/msi.c b/dlls/msi/msi.c
index 72f6966..94a23a9 100644
--- a/dlls/msi/msi.c
+++ b/dlls/msi/msi.c
@@ -3021,3 +3021,13 @@ UINT WINAPI MsiIsProductElevatedA( LPCSTR szProduct, BOOL *pfElevated )
     *pfElevated = TRUE;
     return ERROR_SUCCESS;
 }
+
+/***********************************************************************
+ * MsiDetermineApplicablePatchesW     [MSI.@]
+ */
+UINT WINAPI MsiDetermineApplicablePatchesW( LPCWSTR szProductPackagePath,
+                                            DWORD cPatchInfo, PMSIPATCHSEQUENCEINFOW pPatchInfo)
+{
+    FIXME("%s %d %p\n", debugstr_w( szProductPackagePath ), cPatchInfo, pPatchInfo);
+    return ERROR_CALL_NOT_IMPLEMENTED;
+}
diff --git a/dlls/msi/msi.spec b/dlls/msi/msi.spec
index e3a4a63..5fb1fbe 100644
--- a/dlls/msi/msi.spec
+++ b/dlls/msi/msi.spec
@@ -271,7 +271,7 @@
 275 stub MsiSourceListClearMediaDiskA
 276 stub MsiSourceListClearMediaDiskW
 277 stub MsiDetermineApplicablePatchesA
-278 stub MsiDetermineApplicablePatchesW
+278 stdcall MsiDetermineApplicablePatchesW(wstr long ptr)
 279 stub MsiMessageBoxExA
 280 stub MsiMessageBoxExW
 281 stub MsiSetExternalUIRecord
diff --git a/include/msi.h b/include/msi.h
index f3d4445..0987e1c 100644
--- a/include/msi.h
+++ b/include/msi.h
@@ -196,11 +196,37 @@ typedef enum tagMSICODE
     MSICODE_PATCH = 0x40000000L
 } MSICODE;
 
+typedef enum tagMSIPATCHDATATYPE
+{
+    MSIPATCH_DATATYPE_PATCHFILE = 0,
+    MSIPATCH_DATATYPE_XMLPATH = 1,
+    MSIPATCH_DATATYPE_XMLBLOB =2,
+} MSIPATCHDATATYPE, *PMSIPATCHDATATYPE;
+
 typedef struct _MSIFILEHASHINFO {
     ULONG dwFileHashInfoSize;
     ULONG dwData[4];
 } MSIFILEHASHINFO, *PMSIFILEHASHINFO;
 
+typedef struct tagMSIPATCHSEQUENCEINFOA
+{
+    LPCSTR szPatchData;
+    MSIPATCHDATATYPE ePatchDataType;
+    DWORD dwOrder;
+    UINT uStatus;
+} MSIPATCHSEQUENCEINFOA, *PMSIPATCHSEQUENCEINFOA;
+
+typedef struct tagMSIPATCHSEQUENCEINFOW
+{
+    LPCWSTR szPatchData;
+    MSIPATCHDATATYPE ePatchDataType;
+    DWORD dwOrder;
+    UINT uStatus;
+} MSIPATCHSEQUENCEINFOW, *PMSIPATCHSEQUENCEINFOW;
+
+DECL_WINELIB_TYPE_AW(MSIPATCHSEQUENCEINFO)
+DECL_WINELIB_TYPE_AW(PMSIPATCHSEQUENCEINFO)
+
 #define MAX_FEATURE_CHARS 38
 
 /* Strings defined in msi.h */
@@ -597,6 +623,10 @@ UINT WINAPI MsiIsProductElevatedA(LPCSTR, BOOL *);
 UINT WINAPI MsiIsProductElevatedW(LPCWSTR, BOOL *);
 #define     MsiIsProductElevated WINELIB_NAME_AW(MsiIsProductElevated)
 
+UINT WINAPI MsiDetermineApplicablePatchesA(LPCSTR, DWORD, PMSIPATCHSEQUENCEINFOA);
+UINT WINAPI MsiDetermineApplicablePatchesW(LPCWSTR, DWORD, PMSIPATCHSEQUENCEINFOW);
+#define     MsiDetermineApplicablePatches WINELIB_NAME_AW(MsiDetermineApplicablePatches)
+
 /* Non Unicode */
 UINT WINAPI MsiCloseHandle(MSIHANDLE);
 UINT WINAPI MsiCloseAllHandles(void);