st-xx.bak

When I create new resources, I often see the following error upon getting
/Admin/Properties?checkpoint:

    unable to rename C:\Jigsaw\Jigsaw\config\stores\st-10 to
       C:\Jigsaw\Jigsaw\config\stores\st-10.bak

Apparently, the .bak files stick around when it should be deleted.  My
suspicion is that it's my fault this is happening -- I'm bypassing the
indexer in creating my resources, and using non-extensible
DirectoryResources so that I can maintain control.  Other than that, my
VirtualContainerResources are largely equivalent to DirectoryResources
(they use the same resource store mechanism, etc.).

Any clues as to where I might be screwing up?



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