You can start Microstation with switch to ignore attachments and try to open file. Not sure if it will ignore STM then instead move stm file to different folder before opening. - https://communities.bentley.com/products/microstation/w/microstation__wiki/16069/open-master-file-without-references Regarding DGN format there is option to enable file history but it won't help in this case as it is stored in the same file. You can create a backup copy by key-in:backup but it doesn't do it automatically. It is sometimes possible to recover DGN files by using combination of tools - https://communities.bentley.com/products/administration/f/product-administration-forum/144134/unable-to-open-design-file/447193#447193
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