On this machine I have FSX SP2 +Acc, and the icon is the white silhouette on a blue ground.
On another machine, I have a basic default install of FSX, and it has the same icon.
When I tried 'Change Icon' for the shortcut to the basic install, it did not offer me any others.
However, it being Sunday, I searched my C drive for *.ico files and found over 48,000 of them
So I got a bit more clever , and found the white plane on blue is actually called
fsxsdk.icoThen I wised up completely, and a search for
fsx produced the shortcut with the w-on-b icon, and a file called
fsx.png, which is a big gold X
It lives in C:\Program Files(x86)\Common Files\Microsoft Games\Microsoft FSX (even though my FSX is in C:\FS10 )
So it shouldn't be too hard to resize the png, convert it to ico, and rename it to fool FSX into using it. I can't be bothered, though.
What does bother me is nearly 50,000 icon files, many of them multiple duplicates, averaging about 500 bytes each - that is about 25MB of wasted storage space.
On this machine, fsxsdk.ico lives in C:\Windows\Installer\{CF56984D-35C6-4ADB-9075-394978A427FB} , but it will not necessarily be there on yours - search for the filename.
I use Win7x64