Introducing FMP Reverter 1.0.0

They said it couldn't be done, then others said it could be done. It
turned out the others were right. 

FileMaker® files can be reverted from version 5 down to version 3/4. 

At this time there isn't a lot of experimental evidence to determine the
safety of reverting a file, so be very careful. In my limited
experimentation, everything is fine, but that is strictly anecdotal!

FMP Reverter is a Mac-only "droplet" application which can only be used
by dropping your version 5 files onto it. But that's all it needs to do,
so there you go.

And of course, it's written in FB3.

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http://ethicalpaul.com