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I was assuming you were using MicroStation 2004 edition. The "File|Compress|Options" choice did not exist in versions of MicroStation before version 08.05.xx.xx. Apparently you are using an earlier version so please try using the following key-in command several times to remove the unused shared cell definitions:
delete scdefs
If you are not working in MicroStation V8 please let me know exactly what version of MicroStation you are using. We may need to approach this from a different angle.