[Lazarus] Cross platform 'open file with default program'

[Juha Manninen]

Amazing,
OpenURL already implements what you are asking!
I tested with a local '.patch' file and it opened nicely in Kompare (KDE prog 
for diffs).

OpenURL uses ShellExecuteW for Windows,  'xdg-open' for *nix and some API 
functions for Darwin.

There seems to be lots of quality code in FPC/Lazarus. Good!
One thing is missing though. There is no portable way of getting application's 
icon like ExtractAssociatedIcon does in Windows? This is somewhat related to 
opening the file.
I asked about it some time ago in FPC mailing list and didn't get answers, so 
I guess there is no such function. Does anyone have an idea about how to 
implement it (except for Windows)?

Regards,
Juha Manninen