dds The .dds extension file is a DirectDraw Surface format file developed by Microsoft and is used by the multimedia application Microsoft DirectX to store graphics and data in the compressed and uncompressed form.
tga The .tga filename extension refers to the Truevision raster graphics file format. It is a graphics format that was developed by Truevision incorporated in 1984, a company which was later acquired by Avid Technology. The company was known for developing computer daughter boards designed for digital video authoring and editing. These boards used the Truevision TGA format natively for digital video editing and were supported by both PC and Macintosh at the time.