After importing package remains on database even after deletion

I am a SQL Server newbie. I imported a package stored on my filesystem into my SQL Server 2008R2 database. Later on I deleted the package from the file system. However the package continues to remain in the SQL Server database and even executes!

What little I know implies this should not happen since even SQL Server will be referring to that package stored in the filesystem. So my question is: is this behaviour normal? If not what could be the possible reason for it