Online game skins are in two places. If you want to preserve what you already have, then here you go.
In the Aces High installation directory (default location C:\Program Files\HTC\Aceshigh II) is a folder named 'skins'. In that folder are files with the extension of '.res'. These files are the actual skin files for the game.
If you want to preserve your skins, then copy all those '.res' files to another location. You can ignore any folders in the 'skins' directory as they are just the defaults from the game.
Note: The '.res' files are only used to build the cache files of the skins, which are used in the game. If the cached version of the skins does not exist, they are built upon starting Aces High, so there is no need to copy them.
