unable to load the package as xml because of package does not have a valid XML fomat

Hi Folks,
I was not able to run the ssis job which was pointing to a dtsx file placed in different folder.
I was actually using the below type of file sysmte
C:\MyFolder\Mypackage.dtsc

But we have to use the below one

\\servername\C$\Myfolder\MyPackage.dtsx