wbemprox: Handle escaped backslashes in LIKE queries.

dlls/wbemprox/query.c

@@ -93,6 +93,7 @@ static BOOL eval_like( const WCHAR *lstr, const WCHAR *rstr )
 
     while (*p && *q)
     {
+        if (q[0] == '\\' && q[1] == '\\') q++;
         if (*q == '%')
         {
             while (*q == '%') q++;

dlls/wbemprox/tests/query.c

@@ -1171,6 +1171,16 @@ static void test_Win32_NetworkAdapter( IWbemServices *services )
 
     IEnumWbemClassObject_Release( result );
     SysFreeString( query );
+
+    query = SysAllocString( L"SELECT * FROM Win32_NetworkAdapter WHERE PNPDeviceID LIKE \"PCI\\\\%\"" );
+    hr = IWbemServices_ExecQuery( services, wql, query, 0, NULL, &result );
+    ok( hr == S_OK, "got %08x\n", hr );
+    SysFreeString( query );
+
+    query = SysAllocString( L"SELECT * FROM Win32_NetworkAdapter WHERE PNPDeviceID LIKE \"PCI\\%\"" );
+    hr = IWbemServices_ExecQuery( services, wql, query, 0, NULL, &result );
+    todo_wine ok( hr == WBEM_E_INVALID_QUERY, "got %08x\n", hr );
+    SysFreeString( query );
     SysFreeString( wql );
 }