[arriscad] premature EOF

[Pamela D. Leonard, AIA]

Trying to open a 1992 project in arris 8.2
I'm getting:
Bad database page format - premature EOF or ERROR

I could open it yesterday just fine. Did not save anything. Using it for 
reference only - did take some distances. Getting it off backup does not 
fix the issue.
Ideas?
Which file is it getting a premature end of?
Thanks.
Pamela
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