Zip files on the desktop slow down JFileChooser and so Netbeans on Windows XP. Eclipse remained fast, because it not uses the JFileChooser (and a native widget instead).
However I encounter some resproducable problems with Eclipse Europa. During the export of some plugins I had to navigate to the target folder. After several clicks the file dialog AND eclipse crashed completely. It happens every time. I already lost some unsaved changes, which wasn't very dramatic in my case, but it is good to know. The workaround is simple: I use now the windows explorer and "copy and paste" the path into Eclipse's file dialog and it works.
It seems like: regardless which IDE you are using, you shouldn't use the file dialogs on windows :-).
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