Delete DCX. It'll be recreated next time you open DBC.

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>Thanks for your suggestions. I can see the build output in the debugger's output window. The last line before the error message about the Index makes reference to my database.
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>Sure enough, if I attempt to open that DBC, I get the error message about the Index not matching the table. In Windows Explorer, I note that the size of the DCX file is 0. So, that is what got damanged.
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>Any suggestions on how to fix this without losing my data?
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