In some of my Access 2003 FEs I had the following running in a module that was called up via autoexec
Public Function MaxLock()
DAO.DBEngine.SetOption dbMaxLocksPerFile, 50000
I don't have the documentation in front of me, but it had to do with getting past the max locked files. There was also a reg entry option that I did not deploy
I got an error the first time I opened it and I cant seem to get it again. I dont know if it's running it.