msi: Map neutral parts of package language ids to the system default language id.

dlls/msi/package.c

@@ -1402,7 +1402,17 @@ static UINT validate_package( MSIPACKAGE *package )
     }
     for (i = 0; i < package->num_langids; i++)
     {
-        if (!package->langids[i] || IsValidLocale( package->langids[i], LCID_INSTALLED ))
+        LANGID langid = package->langids[i];
+
+        if (PRIMARYLANGID( langid ) == LANG_NEUTRAL)
+        {
+            langid = MAKELANGID( PRIMARYLANGID( GetSystemDefaultLangID() ), SUBLANGID( langid ) );
+        }
+        if (SUBLANGID( langid ) == SUBLANG_NEUTRAL)
+        {
+            langid = MAKELANGID( PRIMARYLANGID( langid ), SUBLANGID( GetSystemDefaultLangID() ) );
+        }
+        if (IsValidLocale( langid, LCID_INSTALLED ))
             return ERROR_SUCCESS;
     }
     return ERROR_INSTALL_LANGUAGE_UNSUPPORTED;

dlls/msi/tests/install.c

@@ -6057,6 +6057,23 @@ static void test_package_validation(void)
     ok(!delete_pf("msitest\\maximus", TRUE), "file exists\n");
     ok(!delete_pf("msitest", FALSE), "directory exists\n");
 
+    if (GetSystemDefaultLangID() == MAKELANGID( LANG_ENGLISH, SUBLANG_ENGLISH_US ))
+    {
+        DeleteFile(msifile);
+        create_database_template(msifile, pv_tables, sizeof(pv_tables)/sizeof(msi_table), 100, "Intel;9");
+        r = MsiInstallProductA(msifile, NULL);
+        ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %u\n", r);
+        ok(delete_pf("msitest\\maximus", TRUE), "file does not exist\n");
+        ok(delete_pf("msitest", FALSE), "directory does not exist\n");
+
+        DeleteFile(msifile);
+        create_database_template(msifile, pv_tables, sizeof(pv_tables)/sizeof(msi_table), 100, "Intel;1024");
+        r = MsiInstallProductA(msifile, NULL);
+        ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %u\n", r);
+        ok(delete_pf("msitest\\maximus", TRUE), "file does not exist\n");
+        ok(delete_pf("msitest", FALSE), "directory does not exist\n");
+    }
+
     DeleteFile(msifile);
     create_database_template(msifile, pv_tables, sizeof(pv_tables)/sizeof(msi_table), 100, "Intel32;0");