I looked these icons. They're nice but VFP works with BMP files better than ICO files. They needed to convert. Give for about 400$ and pray for a good convert...
Update: I just tried their sample files. They're PNG files. They needed to convert bmp's and create MSK files...
>You may want to check out
http://www.iconexperience.com/index.php. Not free, but the icons are very good and for under $400 you have all the icons you could ever use and you can include them royalty free in your applications.