snapshot files locked

[Jim Newsham]

Hi,
I'm using Cassandra 1.0.8, on Windows 7.  When I take a snapshot of the 
database, I find that I am unable to delete the snapshot directory 
(i.e., dir named "{datadir}\{keyspacename}\snapshots\{snapshottag}") 
while Cassandra is running:  "The action can't be completed because the 
folder or a file in it is open in another program.  Close the folder or 
file and try again".  If I terminate Cassandra, then I can delete the 
directory with no problem.  Is there a reason why Cassandra must hold 
onto these files?

Thanks,
Jim