I have installed a trail version of FrameMaker 12 and cannot open the book and chapter files in FrameMaker 8

Hi

My colleague and I use FrameMaker 8 but I'm considering whether it would be a good idea to upgrade to FrameMaker 12. So today I installed a trail version of FrameMaker 12.

Before opening a book file in FM12, I copied it to another folder so I wouldn't mess up anything. Unfortunately, I forgot to copy the chapter files so I opened most of them from FM12. As soon as I found out about it, I copied them to the new folder, but too late.

Now I'm not able to open the original files from FM8 (and even worse, neither can my colleague). I read somewhere else, that I should save the book file in the .MIF format (I tried both 12 and 7.0) and then open it from FM8. I tried that, but I still cannot open the chapter files.

I get an error message saying: "Althoug xxx.fm appears to be a FrameMaker document, it can't be opened with this release of the product".

I didn't make any changes to the chapter files when I looked at them in FM 12.

What should I do? I case we decide not to upgrade, we will not be able to access this book which is a big problem. I already have some small changes that have to be made.

Thanks in advance for your help!