Can't open an After Effects 10 file in After Effects CS4

Hi!

Today I sent myself an AE project from work (with all the collected files and everything). When I tried opening it at home I got the message:

"The file you are attempting to open was created with After Effects version 10.0 (unknown) and cannot be opened with this version"

I thought all the computers at the office were running on CS3, but maybe the one I was working on today (not the one I usually work on) isn't. Is there any way I can get this project to open so I can work on it from home? Why wouldn't the current version of AE open a file from a previous version? It's pretty much all just 3D layers of animated type with a camera.

Thanks!

Which is stupid... Adobe should allow projects created with a newer version to be worked on with at least the previous one. That some features may not be compatible is one thing, but not being able to even open the project shows Adobe's will to force users to upgrade to the latest version. It's going to be really interesting now that Adobe has moved its Suites to the cloud. I think a lot of people are going to be using CS4/CS5/CS6 for a very long time unless the competition takes advantage of this tremendous mistake from Adobe.