Do you mean like shown in the attached image? When I do that, I don't see an OEM folder, just a basic Windows drive structure. I just want to place the icon in the c:\windows directory.For the web link just place it in the $OEM$ folder.
$OEM$\$1\Users\Public\Desktop\your web link
When you mount your image, right click and choose the explore image option, a window will open with the directory of the iso.
Be more specific for the icon file.............................what exactly you want to do with it.
cd \path\to\ISO\folder
mkdir sources\$OEM$\$1\Users\Public\Desktop
cd sources\$OEM$\$1\Users\Public\Desktop
copy file .