Check this portable file manager out.

Check this portable file manager out. I haven't tried yet. Just let you know.
http://www.xyplorer.com/

Below is what posted on the download page.

The installation of XYplorer totals to about 1.7 MB. No further files are added anywhere to your system, and nothing will be put into the registry but uninstall information. Also, running the program does not change your system or registry. XYplorer can be completely removed by running the included uninstaller, or by simply deleting the install directory.