Help, what do i do with .sav file snapshot? Virtualbox

Hi, My instance has corrupted so I downloaded a new VDI and thought I could take the files from my snapshot folder and import from there. I run Home assistant in virtualbox. The files in my snapshot folder (in the virtualbox folder) are .sav and I cant seem to do anything with them. Please help I dont want to have to rebuild 6 months of work and thought I was doing good having these backups.

Ok I was being dumb, the .sav files are snapshots from saving the state of the virtualbox, I used Poweriso to open the vdi of the broken instance and then extracted the latest snapshot from there. running it now so fingers crossed.