FileFilter files without extension (*.)

I want the file dialog to only show files without extension, so I set the filter to '*.', but the dialog shows no files at all.
var legendFilter: FileFilter = new FileFilter("Legende", "*.");
legendFileRef.browse([legendFilter]);
These legend files are created by another application and don't include an extension.
I cannot ask the user to rename the files prior to upload, I cannot change the output of the other application and I do want to filter to prevent selection of incompatible files as much as possible.
Flex 4.6, Windows 7

Would that be:
new FileFilter("Legende", "null")
or
new FileFilter("Legende", null)
If this is not correct, maybe you just use browse() without fileFilter,
and then check the extension property of file() that selected from file browse

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