When creating an instance of a com object (ActiveX object) of a dll Open Office keeps the dll locked in memory until all open openoffice instances are closed.
The garbage collector of OOo Basic is not cleaning the references properly.


to reproduce (sample using windows' scrrun.dll )

1- open two open office writer documents (I'm gonna call them odt1, odt2)
2- add a macro to odt1 and add the piece of code below

Sub Main
 dim fso 
 fso = CreateObject("Scripting.FileSystemObject")
 if fso.fileexists("C:\a.odt") then
 	msgbox ("File C:\a.od exists")
 else
 	msgbox ("File C:\a.od does not exist")
 end if
 
 fso = nothing
End Sub


3- run the Main sub
4- close odt1
5- try to rename of remove the scrrun.dll (C:\windows\system32\) , windows doesnt let you. If you use unlocker (http://www.emptyloop.com/unlocker/) it shows soffice.bin locking the file.