Can't open old iWeb domain file (yes, I have asked in the other forum!)

I had to wipe my MacBook hard drive and reinstall my data and OSX. Having tried to restore my iWeb domain file from Time Machine, I find I am unable to open it. (I've asked this question in the iWeb forum but was eventually directed here.) I've tried seemingly everything, including changing the file's permissions, wiping iWeb preferences, creating a new domain, deleting it and replacing it with the old one. Still I'm told iWeb can't open the file.

Could it be corrupted? It's probably relevant that it was created under a different account (I had to create a new one when I wiped the disk) and I believe iWeb doesn't like opening domains created by "another" user.

Any help much appreciated. It's important because I am applying for a new job and my online folio -- aka my iWeb website -- is not up-to-date, which looks very strange.