[This is preliminary documentation and subject to change.]
Setup provides users with the option to supply a floppy or compact disc that contains migration DLLs for their target applications. Setup searches the provided media for MIGRATE.DLL files. For each DLL it finds, it copies the directory containing the DLL and all other files and subdirectories in that directory to a unique subdirectory.
Note The Windows NT 5.0 compact disc also contains migration DLLs.