Looks ok for a specific task, but the code is not reusable at all. It would be more useful to create a function ignore_except that could be used like this to perform the same task:
shutil.copytree(srcDir, dstDir,
ignore=ignore_except('*.pyc', '*.ui', '*.txt', '__main__.py', 'dcpp.bat'))
The source code of shutil.ignore_patterns would be a good starting point for such function.
