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An .ASC file compresses the project files. It optimizes the project and can clean up minor corruptions
which the .PRZ does not do.
A .PRZ file compresses the project files. It will also archive the .DIA folder, (if one exists), and includes
the .RDE files which the .ASC file does not include.
Often projects that have errors on an export can be saved as a .PRZ file.
Both .ASC and .PRZ files can be opened by later versions but not earlier versions of Concept.