Quit using Mendeley people!
They started encrypting your database so you cannot easily move it over to other tools any more.
That link also helps you saving your data before it's too late.
(Elsevier are a bunch of crooks, blocking interoperability one-way and not the other. Almost as bad as Google blocking uBlock for your safety...)
@arjen when did they start doing that?
@arjen @dantheclamman Correct, and they even encrypt the database created by the "Backup" function. Only way around it is to maintain a v1.18 install somewhere (I have it on my Win10 virtual machine, pinned to that version using Chocolatey) or maybe this very complicated approach (not mine): https://eighty-twenty.org/2018/06/13/mendeley-encrypted-db
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