where i get a message "Select an application from the list to open the file"
Did anyone experiance this problem. even i select different location to download in the files but the application manager, which usually lunch automatically if i just doubel click on the file for the first time to install, didn't open to do its job.
Can i download applications from download section now and after sending them to n900 install them without using internet connection
You can, but you'll probably run into dependency issues - the app requires certain libraries installed, so you then have to download those, and they require other libraries, and so on. Using the App Manager, all of that is taken care of in the background.