Here is an example DAOS NLO file name:
It appears to have two components, the first 40 characters are the file's SHA1 hash, and the next 8 characters are its file size.
This is very similar to how we store messages in the Preemptive Email Vault. The same file in it would be
Again it is the SHA1 hash of the file, but in our case we also leave the extension.
If you want to find more about the Preemptive Email Vault check out our website.