Re-bumped.
I have a HD2 Yuki/Xbmod BTTF on Mango
I managed to make copies of store.vol and pimIndex.vol using touchexplorer
http://www.forum.touchxperience.com/viewtopic.php?f=29&t=582 (it errors but the copies are made and show up with contents as opposed to 0 bytes) but I could not delete the originals nor rename the new .txt files to the original names, and I left them in the stores folder.
on reboot the microsoft folder in application data became a file with 0 bytes, so there is no access to any folders within it. The phone works fine and sms are still there.
Somehow the phone has sensed my fiddling and locked me out, or a bug in touchexplorer or I should have moved the files before rebooting.
I will have to try again next re-flash.