I don't understand, are you complaining about a real A1200 or are you complaining about WinUAE?
If you have an A1200, what do you need WinUAE for?
If you are using WinUAE, what do you need the A1200 for?
ADF files are rips of floppies. WinUAE doesn't have an Amiga floppy drive, so you connect these ripped ADF files instead to pretend that you do have a floppy drive. ADF files contain floppy disk data.
HDF files are the hard drive equivalent of ADF, HDF files giev you a virtual hard drive. Much like VirtualBox uses VDI files that pretend to be hard drives or VMWare uses VMDK files that pretend to be hard drives.
If you have an A1200, then you have an Amiga floppy drive. What do you need ADF files for?
If you have a real 4GB CF card connected to your real IDE bus acting as a real hard drive in your A1200, what do you need an HDF file for?
I'm really sorry, but it sounds like you're jumping back and forth between two very different things, and I really don't understand the connection between them nor the reason for both.