One of our customers lost a couple of Document CALs and couldn't restore with restoring the original filename.
It seems path and/or filename has a max-length.
The original filename was something like "... as400.qvw", a total of 31 chars.
The Cal administration renamed it to "... as.qvw" with a total of 28 chars.
We were able to restore the Document CALs renaming the file to the short name.
It would be nice to get an alert if document name exceeds 28 chars in order to avoid these situations.