File name under UNIX

Hi,
I have this problem: a part of my application is reading a file name. Sometimes the file name contains special characters: �, �.... Everything works fine when I'm testing on Windows. When I'm testing under UNIX I get '?' insteed of �. I can see that la file has a corect name on the HDD.
Why my application displays different results on Windows and UNIX?
Ex:
File f = new File("bla/bla1/bla2");
Filter filter = new Filter(".txt");
String[] files = f.list(filter);
The files array contains diferennts strings on Windos comparing to UNIX.

Que? File names are allowed to contain certain characters in windows, and another set of characters in unix.
/Kaj

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