Since I often have this problem, I've found a workaround ( not a nice one, but it works when the formats aren't too different).
I simply change the number of the LyX format.
Open your file with a text editor and see the second line e. g.
\lyxformat 276
Change this number to match the number used on the old file format and it can work.
Of couse make backups, since it can be dangerous.

Hope it helps.
Siegfried.

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