TFileListBox error 183 when setting Directory property?

Hope you can help

I am setting the directory property of my TFileListBox, but the first time
I do it (only the first time) I get EInOutError 183, I pass for example
'e:\' or 'c:\'.

Any idea's why this happens, the drives exists.

I use Delphi 2.01 on Windows 95 OSR2.