Orphaned files in the subdirectory of the database

I am working with a small psql database (<1GB) of version 8.3.3 on an
industrial application. The OS is Windows xp embedded.

To keep the database in size, I schedule vacuum full and reindex in my
program once a day. When I experienced disk size shortage, I found files
of ~50MB in the subdirectory of my database (in \data\base\<oid of my
db>\), which were (seemingly) not touched by vacuum/reindex (last
modified date older then of the other files). I checked them with
oid2name - they are not in the database.

Can anybody tell me, what these orphaned files are, where they come
from, and how to proceed with them? Is it safe to delete them?

Thanks in advance,

David Krois

"YES WE SCAN !"
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