I'm guessing here:
Then the icon changed to a film strip icon,
Then previously, the Project "Containing" Folder was a Windows Yellow Folder, "containing" the following Windows Yellow "Sub" Folders, which you can see:
All I see in it is folders called "Obj", "Settings" and "Workgroup"
.
Outside of Studio, go to: Start / My Documents / Pinnacle Studio / My Projects.
What you should have showing, is a Studio generated Grey "Film-Strip" Project Folder Named CHRISTMAS 2006 & a christmas.stx File, that Opens your Project into the Timeline.
As already Posted by Towbar, you can't Open the Grey Folder, to prevent you from tampering with it.
For unknown reasons, the Grey Folder (which can't be Opened, apart rom a Registry Hack) turns into a Windows Yellow Folder (Which can be Opened). When this happens, the Files in the Sub Folders have usually been corrupted & you have to re-do your Project.
However, if you have an empty CHRISTMAS 2006 Yellow Folder with the 3 yellow Sub Folders showing separately, Copy (Not move) those to the Empty Folder. If the Yellow Folder already contains the Sub Folders, try Opening it with the christmas.stx File. Likewise if you have the CHRISTMAS Grey Folder.
If you haven't got a christmas.stx File, you can create a new one. I'll Post a Link re; how to in my Post here.
We also need to have a Screen Shot of what you have showing in your "My Projects" Folder, before a decision can be made whether or not your Project can be recovered. I'll Post instructions re; how to, in this Post.
In Explorer I am able to click on the film strip icon and right click to properties, where it tells me there is over 5 MB of data in there. I know my video is there.
The Project Folder doesn't contain any Source Files, which remain "As is", in their relevant Locations. It contains information re: those & your last Edit. The number of Files exceed the number of Files you have in your Timeline. 5MB looks too small to me for your Project to be complete.
All of the above may seem garbled, but the only people who can provide a logical explanation & fix are Pinnacle, whov'e resolutely ignored the problem for approx 4 years, despite many requests to do so