Exchange 2010 locked folder/files

We used ADSI edit to delete an old Exchange 2010 database, but may have forgotten to dismount first. Stupid yes, but here we are. Anyway, while the reference to the database has successfully been purged (that is, it no longer shows up under organization configuration->mailbox) it cannot be deleted from the drive itself. It seems it's currently locked by 'store.exe'. Is there any way to unlock the file for deletion without having to stop store.exe or the the governing information store service? We've tried an elevated command prompt delete, unlocker, and lock hunter with no success. This empty db is taking up a considerable amount of storage space and we would like to take it down without necessarily planning a maintenance window; if possible. Any ideas, or must we stop down the information store service(s) to do this?

Thanks.