Lost all Subclips from project after system crash

Hi,

I'm new to the forum and tried to find an answer but I'm not seeing it so I apologize if this is covered somewhere else.

I've been using Premiere Pro (CS4) for a couple of years.  I've made extensive use of SUBCLIPS for projects and I found they helped organize the building a complex sequence in several documentaries and they have worked well for me - until my system crashed. While the project opens and I find all media, I find that all SUBCLIPS are gone.  Have I lost them forever?  Can they be recovered?

I have built a new system and installed my old data hard drives, but I have a newly loaded C-drive.  I am running Windows 7 on both the new and the dead system.  I can still extract data from the old C-drive if needed.  

I am wondering just how Subclips are stored.  They do not appear to be files – where do they live?  Can they be transferred? 

I would really like to avoid the number of hours it will take to rebuild those subclips.

Thanks!