I don't want to display file name in the title of pdf file I opene it

Hi all

my program has dw that contains links to pdf files

when user clicks in one link , the program open the  file associated with this column(link)

i use run("program name (used to open pdf file)" +ls_filename 

for example

run("C:\Program Files\Free PDF Reader\FreePDFReader.exe "+ls_filename  )

OR 

  run("C:\Program Files\Foxit Software\Foxit Reader\FoxitReader.exe "+ls_filename  )

OR

when i want to use default associated to pdf file

run("explorer "+ ls_filename )

OR

i can use browser to display the file but browser display the full path of file

for any of the previous  method i want to hide the file name appears in title bar and let the user could not change the setting to display it

how can i do this

best regards