These are files that did not exist in X5. RH doesn't always manage to convert the project correctly to account for these files. However, you should be able to manually create the files RH is looking for, as follows.
First, make a backup copy of your project.
Next, with the project closed, use Notepad to create the 4 missing files with the content below. (Note: the lines starting with ** are for identification only and should NOT be included in the files.) All of these files reside at the root level of the project.
After you've created these files, you should be able to open your project OK. If you have trouble, close the project, delete the cpd file, and try again.
I don't see any "content below". I need a clean copy of RHFrameDocs.apj because RH8 won't open my RH7 project without it (and possibly others). I never had such a file in my RH7 project, as far as I can see.
Didn't you see the content Gravenstein posted?
Just kidding of course. Looks like that part was missed.
In thinking about this, it might be simplest to create a new blank project, then just copy the missing files to your project.
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Tried that. RH8 still reports that it can't read RHFrameDocs.apj.
Are there any other "temp"-type files (besides the CPD file) that I could try deleting, the RH8 will recreate when I convert the project?
It sounds like you are using source control. Have you tried checking out your entire project before upgrading? I've noticed RH can sometimes get a little confused trying to checkout and upgrade at the same time.