Assigning an icon to an extension saved by .net application

[amirhosein najafi]

Hi All,
Using Visual studio 2008, I have an application that its data can save
to a binary file, using *.SDB extension, Moreover users can open this
file from my application. I have 2 questions about this.
1- How can I assign an icon to this saved file with SDB extension when
my application has been installed in other computer?
2- Similar to *.sln file (for Visual Studio project), How can I assign
tow icon to single extension? For example when a solution is saved
with visual studio 2005 its icon different from that one saved from
visual studio 2008. In first, the solution’s icon contains “5” but in
08 solution’s icon contains “8”.
Thanks Again.