I'm using Excelfre software to open excel file from my application package. My application package is using Dev c++ and FLTK package. When I click from my application to open excel file the spawnv function open for me the exe file that created using Excelfre software. It runs smoothly in windowx XP. But when I changed to new computer which has vista, it can't work. How to solve my problem? Your help is highly appreciated. P.S I checked in my windows firewall setting and put Excelfre as exception list but it still doesn't work.