Are these .mdf and .ldf files separate from the ones that your msdb database is currently using? If so, and if you are getting a sharing violation error, that probably means that those files are being used by another live database somewhere. If that is the case, then you can script out the DTS package from that other database. However, it sounds like those files are the same ones that are currently being used by your msdb database. Every database uses at least one database file (which usually has the .mdf or .ndf extension) and a transaction log file (which usually has the .ldf extension). If you don't have a backup of your msdb database, and if you don't have separate .mdf and .ldf files from a previous version of your msdb database, then you are probably out of luck.