hhctrl.ocx: Ensure that the topic within MSITStore url's begins with /.

dlls/hhctrl.ocx/help.c

@@ -115,7 +115,9 @@ BOOL NavigateToChm(HHInfo *info, LPCWSTR file, LPCWSTR index)
     LPWSTR ptr;
 
     static const WCHAR url_format[] =
-        {'m','k',':','@','M','S','I','T','S','t','o','r','e',':','%','s',':',':','%','s',0};
+        {'m','k',':','@','M','S','I','T','S','t','o','r','e',':','%','s',':',':','%','s','%','s',0};
+    static const WCHAR slash[] = {'/',0};
+    static const WCHAR empty[] = {0};
 
     TRACE("%p %s %s\n", info, debugstr_w(file), debugstr_w(index));
 
@@ -127,7 +129,7 @@ BOOL NavigateToChm(HHInfo *info, LPCWSTR file, LPCWSTR index)
         return FALSE;
     }
 
-    wsprintfW(buf, url_format, full_path, index);
+    wsprintfW(buf, url_format, full_path, index[0] == '/' ? empty : slash, index);
 
     /* FIXME: HACK */
     if((ptr = strchrW(buf, '#')))