find the offending files and SINGLE click on them. Right click (Control + click) the file and choose Get Info.
On the line that says nameoffile.jpg change the jpg to MVI
When prompted, say yes to changing the extension.
Recently (and probably rather stupidly) I did some copying and pasting in Mac iPhoto ver 9.1.5 (6.5) of some MVI movie files. Later I wanted to view some of these MVI files but when I clicked on them I got a message saying
" A Necessary Date Reference Could Not Be Resolved".

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