A folder, having the extension .lnk in the name,  can not be opened by 5.0fcs and later versions.
REPRODUCE:
1) Create a folder which has .lnk in the name
  ex.  test.lnk
2) Go to .\jdk1.4.2_14\demo\jfc\FileChooserDemo
3) Invoke "java -jar FileChooserDemo.jar"
4) Click "ShowFileChooser" button
5) Try to open the folder created at step 1)
 5.0fcs and later versions will no be able to open the 1) folder.
 1.4.2_14 can open the folder.
CONFIGURATION:
 OS :WindowsXP(SP2, Japanese)
 JRE : 5.0fcs, 5.0u8, 5.0u11, 6.0u1