Hello again.
I believe that the iMovie 4 projects that you have are infact now iMovie 6 projects.
I mentioned above that the structure of your projects resembled that of iMovie HD 6 projects not iMovie 4 .
iMovie 4 projects do not contain folders called Cache or Shared Movies, but HD 6 do.
Is it possible that after you installed iMovie 4 and iMovie HD 6 onto your Snow Leopard Mac that you opened up the iMovie 4 projects and selected to have them converted to HD 6 projects.You do get a warning when this happens to say that they cannot go back to an older version.
Today I created a test project in iMovie 4 and saved to desktop.
I then opened up this project and it asked me if I wanted to open it in iMovie HD 6 which will make it unreadable by older versions.
By selecting OK it makes it an iMovie HD 6 project with the stucture that you have for yours above.
You said:
" I then used the Apple downloads to get iMovie HD 6 installed on my first iMac (Leopard then Snow Leopard) which they also won't open with. "
So not sure why they won't open with iMovie HD 6 on your Snow Leopard Mac.
"The only iMovie 4 projects I've still got are these ones under discussion, which Iretrieved using "Recovered Files" - via the 'Data Recovery' feature in TechTool Pro 7. "
Have you got the original iMovie 4 projects on a Hard Drive somewhere.What was the reason for using Data Recovery?
Were the video clips from a DV camcorder? If so then they will be .dv
If you double click on ,say,Clip 01 does it play in QuickTime Player ? If so go up to window and select
Show Movie Inspector and see what the Format is.
I have Snow Leopard, iMovie 4 and HD 6 and can perform the task as posted in my original post above.
Some sort of corruption seems to have taken place, possibly in the data recovery??
Post back with info as all may not be lost.