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open an existing key file
open an existing key fileif update is 0, the file is opened for read access only, if update is not 0 the file is opened for reading and writing
a file set tag can be attached to the file, if a file having a non NULL file set tag is flushed to disk all files having the same file set tag attached are flushed as well.
RESTRICTIONS:
- the file must exist already
- the current record of the file will not be set