[news.eclipse.newcomer] Opening Files in Eclipse Problem

[pm@xxxxxxxxx (Franz Philipp Moser)]

Hi list,

I tried to open a File in Eclipse from a plugin using the howtos in the 
FAQ. This worked fine. But now I want to jump to a Linenumber and here the 
problems starts.

I have followed the FAQ 
(http://wiki.eclipse.org/FAQ_How_do_I_open_an_editor_on_a_file_in_the_workspace%3F) 
but I do not know how I get a IFile.

The FAQ state: IFile file = <choose the file to open>;

Can somebody tell me what to place instead <choose the file to open>? I 
want to open a file from the Filesystem, not the workspace, too.

Thanks for your help

philipp