The file popups use the windows file dialogs so if you want to get into windows messages and find out the handle to the controll you can use windows messages and property calls to change the appearance. It's not always well documented and it's very time consuming with very little help and support, but if you really want to do it it can most propably be done! I can give you some pointers were to start. Let me know if you want to persue this further.
Jattie van der Linde
Engineering Manager, Software & Automation
TEL Magnetic Solutions Ltd