O I didnt realize you couldnt see the custom tab in propeties on windows 8 w/o the folder being on the desktop.
He is incorrect- the Customize tab appears on any folder.
Im actually making renders from anime and using converticon.com to create the .ico file type to make the renders appear instead of the yellow folders. Their all being saved into my document folder so they arent hidden or anything in the case of what BC_Programmer was saying.
I was not referring to the icon being hidden. The data dictating the Folder icon is saved in a desktop.ini file. Since it is an external and you are talking about moving it between computers, it is likely it appears under different drive letters. On the PC you set the icons on for example the folder might be S:\somefolder and the icon is S:\somefolder\youricon.ico, so that specific path get's stored in the hidden desktop.ini file. When you plug it into another PC, the external might be a different letter, which means the icon is P:\somefolder\youricon.ico, but the desktop.ini still specifies S: so the folder icon cannot be retrieved.
If you use notepad, you should be able to enter the folder path of desktop.ini; for example, P:\somefolder\desktop.ini and open it, even though it won't normally be shown. You can then edit it to remove the path specification, and just say "youricon.ico" for example.