Replication Error process could not read file HELP PLZ

I am getting this error on replication and don't know why. Any ideas?
The process could not read file '\\NJRARSVR00E9\d$\sqldata\system\MSSQL$P001\ReplD ata\unc\NJRARSVR00E9$P001_PTR_PTR\20040707104224\s napshot.pre' due to OS error 5.Why is the extension "pre"? My understanding you're using an alternate location for distribution agent to read snapshot files from. If the file name is snapshot, I also assume that you chose "compression" for it, which means that the extension should be "cab"...What gives? And also post the entire error or errors.