Here's the step by step to opening your .fp5 files in FM15 or any version inbetween:
If you want to be in supported territory and you are running MacOS Sierra, then yes you need to use FMP15. If you don't care about support then you can take your changes and see if your FMP5.5 still works. It may or may not, partially or completely.
Many thanks for this. Would seem that I have to go for FMP 15. I have already tried to run v5.5 on Sierra but no luck as it is a PowerPC version which would only seem to run in OS 10.6.8. as the latest version to be able to do so. My crash completely killed the hard drive and so I have no access to Snow Leopard anymore and I have found no source for it - so far.
Sorry if I should have found the solution that you pointed me to but I didn't!
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.fp5 files (FileMaker 5, 5.5, 6) won't run under OSX later than 10.6 (~ not sure, but under newer OSX FM5-6 won't be able to run). We got a virtual machine with 10.6 Server to maintain old .fp5 databases
Many thanks. I was already aware that FMP v 5.5 wouldn't run under later versions of OS 10 beyond OS 10.6.8 (See my reply to wimdecorte). Interested to see your comment about a virtual server for 10.6. .As an individual that's not really an option for me and so far I haven't been able to track down a source of OS 10.6.8. I'll probably have to go for FMP 15
not a virtual server - a virtual machine (VMWare) under OSX 10.11 and 10.12 running OSX 10.6.x Server. at that time (10.6.x), only OSX Server could be virtualized
we got quite a few solutions under older FM versions - even some FileMaker Pro 2.0/2.1... (we will no longer support v2.x, but we can migrate those versions to a current one)
At the moment, I got one machine running 10.6.8 - but this machine is on the wqy to our museum, therefore we created the vm...