ystems it is up to
the user to know what the format is, although there are more-or-less strict file-naming conventions. The multiplicity of file
formats is a continuing problem for both software developers and users. [Computer and Information Sciences] 
a., The quality of a record that makes it immutable and requires changes to be made by appending an update or creating a new versi
on. [Archives] 
fixity 
n., A cover in which non-electronic records, belonging in the same dossier, are loosely kept, usually i