Java.io.File and uppercase/lowercase

Hello,
I am running into a weird problem with java.io.File on a Windows system. My program needs to validate a path the user entered. Sometimes, the path will contain a directory name that should be uppercase, but which the user entered in lowercase instead, and the <File>.exists() returns true anyways. I know on Windows, on the command line, directory and file names are not case-sensitive, which is probably why it was done that way. But this is causing problems because once the path is (supposedly) validated, it is handed to a Unix program (case-sensitive), and if it's not really valid there, the user has no way of correcting it. Whereas if it were found as invalid in the Java program, I could pop up an error, and the user could correct it.
The bottom line is, is there a way of telling a File object to return false if the path name is not EXACTLY identical, on Windows? Or would I have to check the path myself, without relying on File?
Thanks in advance,
J-S

In this case, this is not acceptable, since the files or directories on disk can be in any case. I just need the entered case to be exactly the same as the files.
In other terms, I need File.exists() to return false if the case does not match. I would think there is a way to do this, since internally, the function checks if the operating system is Windows or Unix before doing the comparison, and acts differently in each case...
From http://java.sun.com/j2se/1.3/docs/api/java/io/File.html (see equals or compareTo method) :
"On UNIX systems, alphabetic case is significant in comparing pathnames; on Win32 systems it is not."
I would like to force the Unix way of doing.

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