QTemporaryFile fails in case of name collision with a directory

When QTemporaryFile attempts to create a new file in createFileFromTemplate, it fails if the test filename exists and is a directory. It appears that windows returns error code 5 (Access denied) rather than ERROR_FILE_EXISTS in this case, and this is not handled.

For example : Supplied template c:\Temp\file.XXXXXX , if a directory exists already called c:\Temp\file.Hp1234, QTemporaryFile::open() fails if this name is tested. Combined with the fact that the template name generation is not so random (PID + qrand()), this can cause recurring problems.