I'm using Windows 7 Ultimate RTM and I'm having the following issue,I cannot rename the folder 'ConAir.1997' to 'Con.Air.1997'; I get thisRename popup window, 'The specified device name is invalid'

what happens if instead of a "." (period) between "Con" and "Air" you use a "-" (hyphen) or a "_" (underscore)? I don't think you can have two "." in a directory name.

The "-" (hyphen) or a "_" (underscore) works fine.I have1-7 "." within other titlesanddon't haveany problems.

Multiple "."s are not a problem.I think it has something to do with CON being a reserved name, such as COM1, etc.

We cannot create a folder named any of these keywords : CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9. these keywords are used by Windows internally and are reserved Keywords. CON was used for CONSOLE, PRN for PRINTER, LPTs for PARALLEL PORTS etc.

We cannot create a folder named any of these keywords : CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9. Apparently you can't even use them for the base name of a file.

Hi neilkpd,Please do not use the following reserved device names for the name of a file: CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9. Also avoid these names followed by an extension, for example, NUL.tx7. These words mean devices behaving like files in some ways and are therefore reserved. Folders obey filename rules. But you can trick the system using a low level tool and create an unusable file or folder. You could use it for a copy protection for instance. If you really need a folder named CON, then use "CON<alt-255>". This works and looks like CON because Alt-255 looks like space but is different. Please note: we should press 255 keys on Numeric keypad.Meanwhile, we can use command "md CON\" to create a folder named CON. In addition, I would like to share more information with you. Please refer to File Names, Paths, and Namespaces. Hope the above information is useful for you.Thanks,Candice

Excellent reference, Candice.But it does not say that you cannot use a filename such as CON.AIR. It just recommends against it:"Do not use the following reserved device names for the name of a file: CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9 Also avoid these names followed immediately by an extension; for example, NUL.txt is not recommended."

Please Please Please !!!!! do not use the following reserved device names for the name of a file: CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9 If You Did You Will Put Your Selfe Under Terms responsibilty. Thread Closed!