A DIB (Device Independent Bitmap) file is a raster image file that is similar in structure to the standard Bitmap files (BMP) but has a different header. It can be opened with almost all applications that can open a standard BMP file on Windows as well as macOS. DIB are binary files and have a complex file format similar to BMP
EMZ is a file extension for a compressed graphics file used by the Microsoft Office Suite and Visio. Stands for Enhanced Metafile-Zipped. Contains an EMF (Enhanced MetaFile) image file that has been compressed using GZIP compression.