Since the 90s DOS Days I knew about this .
You cannot create a file or folder that is
- CON or CON0 – CON9
- PRN or PRN0 – PRN9
- AUX or AUX0 -AUX9
- NUL or NUL0 – NUL9
- COM or COM0 – COM9
- LPT or LPT0 – LPT 9
With this funny error message
[The specified device name is invalid ]
but 20 years later Microsoft has not given up those reserved words.
The problem , if you are moving files or folders from other non-windows systems to a windows system you can get some copy failures etc
Here is the official ms posting.http://support.microsoft.com/kb/279868