I looked for an answer in the forum but it seems there is any (anyway 23854 topics are a great number to look into

I'm sorry if it has been already answered, in that case could you point me to the correct thread?
I do need to open with DP9 and Mach Five 3 some old DP projects with Mach Five 2 in it (without Mach Five 2).
I mean, I have these projects I have to use again, they were created with DP7 and Mach Five 2.
I've tried to open them with DP9 and Mach Five 3 and I hoped they were converted automatically to a project with Mach Five 3 (instead of MV2), but they don't.
I've also tried with DP8&Mach Five 3 (on a second startup partition with MacOS 10.8.5) but the problem is the same.

At the old times I didn't save any Mach Five 2 multi so I can't load them from scratch in MV3 (Mach Five 3 opens any Mach Five 2 instrument with no problem).
Is there any way to "force" DP9+MV3 to open those old DP7+MV2 projects?
Am I doing something wrong?
Needless to say, I have no more DP7 nor Mach Five 2.
Any help will be appreciated.
I thank you all in advance.
Ale