Restoring Site Definition Files - for a large number of sites

I exported all my site def's from old PC.  Have them in a folder.  In DW on my new machine, I can go into "Import" and select multiple sites but then it requires me to, one-by-one, repoint to each folder for each website.  I have all my websites - with all the same names - under a "Webs" folder.  And I probably have 1,000 websites that all have to be imported. Please tell me there is a way to just drop these all back in without having to renavigate to the Webs folder for every single site. 

I tried going into the REGISTRY folder, which I located, but couldn't figure out how to insert / paste the .ste files all into the registry.  Is this step only necessary to copy / export the existing definitions?

What can you suggest for people like me who need these site definitions easily moved / copied / synced at all times?  It takes a massive amount of time to reconnect all of these. 

Thanks in advance.