Will FileMaker 13 work on Mojave?

No. But you can check for yourself compatibility: https://roaringapps.com/apps

KayBee07 wrote:

Thanks Leroy!

Before checking, I've upgraded to Mojave … and all my data seemed lost.

However, it's possible to download FM17 demo (45 free days) so one can salvage the data.

KB

Good computing KayBee07 ! thanks for the report.