Problem with reopening in image viewer

Yes hi, I can edit the file in photoshop just fine but when i save it back as a .tga then tryto open it in the image viewer it says that it isnt compressed properly. Any help you can offer?

Make sure when you save it, you select 32-bit from the window that pops up just before it saves

Also make sure you have ALL COMPRESSION SETTINGS TURNED OFF (sry for caps) before you save. Compressing the file in anyway before converting is bad.