MT 2015 and Studio 2015 cannot open sdltb files

Multiterm and Studio 2015 no longer open sdltb files from clients. They open the sample file and older mdb files, but not the sdltb file I need to open. I tried uninstalling and reinstalling, but the situation remains the same. What can I do? The error message mentions verifying that it's valid and that I have permission.

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