[Zope] Filesystem Directory "double view"

[Utilisateur1]

When I add a FileSystem Directory View in order to install PloneCalendar in  my portal_skins Folder, I choose the Id: PloneCalendar
no problem the  Filesystem Directory View at  portal_skins/PloneCal is well populated 
but I can notice now  in the directory plone_3rdParty a new directory created at the same time  
2003-09-26 13:01 
it is called  PloneCalendar-1.0.2  (despite the fact that I have renamed in my file system the directory PloneCalendar-1.0.2 to PloneCalendar) (There are currently no items in PloneCalendar-1.0.2)
and ...
all my skins but Custom seem to have been modified  Last Modified Time 2003-09-26 13:01 
Is it supposed to happen?
Shall I add that I "loose" skins every timeI update Plone?
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