location of DTSX package I need to know the location of a DTSX package which is stored in "file system", 

It is visible under Stored pacakges-->filesystem-->Package1 in Integration services .

I tried to do a windows search using "Package1.dtsx" string, But the results lists 5 packages with the same name, How do i know which is the package listed in integration services?. Is there any table i can query to get this info?
On your server, there is a file named MsDtsSrvr.ini.xml which is located at C:\Program Files\Microsoft SQL Server\120\DTS\Binn (for sql server 2014). When I examined this file it stated "..\packages" for the location, so I went to the DTS folder then into the packages folder and the files were there.

Depending on your version, architecture, and installation path) of SQL Server, you might find these files at 


C:\Program Files\Microsoft SQL Server\90\DTS\Binn\MsDtsSrvr.ini.xml (2005)
C:\Program Files\Microsoft SQL Server\100\DTS\Binn\MsDtsSrvr.ini.xml (2008/2008R2)
C:\Program Files\Microsoft SQL Server\110\DTS\Binn\MsDtsSrvr.ini.xml (2012)
C:\Program Files\Microsoft SQL Server\120\DTS\Binn\MsDtsSrvr.ini.xml (2014)
C:\Program Files\Microsoft SQL Server\130\DTS\Binn\MsDtsSrvr.ini.xml (2016)