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When you open an R4 database, R5 clients rebuild views so the database can be properly opened in R5. In order to rebuild the views, R5 needs write access to the media storing the R4 database. If the R4 database is stored on read-only media, such as a CD-ROM, R5 cannot rebuild the views and cannot open the database. You must copy the R4 database to read-write media, such as your hard drive. If the database is set to 'read only' at the file system level, you must also reset the read attribute of the file to 'read-write' using the operating system file management system.

An example of this is the README.NSF file supplied on the root of R5 installation CD-ROMs. It is an R4 database; you can use an R4 client to open the database directly from the CD-ROM. If you want to open it using an R5 client, you must copy it from the CD-ROM to a hard drive and ensure the file is set to read-write access.