It’s super fast — much quicker than opening the file — and ... QuickLook supports tons of file types, including PNG, APNG, JPG, BMP, GIF, and PSD, as well as RAW images.
If it identifies an attachment that might be unsafe, it prevents you from opening the ... when you open the file by using the Microsoft Windows Picture and Fax Viewer: .bmp, .dib, .emf, .gif ...