For a start, try using single quotes around your literals ...
You may first want to create an sp to help. Something like:
Create procedure [dbo].[s_ExecutePackage]
@FilePath varchar(1000) ,
Declare @cmd varchar(1000)
select @cmd = 'dtexec /F "' + @FilePath + @Filename + '"'
exec master..xp_cmdshell @cmd
This will help you execute the package from within your sp, once you have enabled use of xp_cmdshell, of course.
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