| Extension | DWG |
| Full Name | Drawing |
| Type | CAD |
| Mime Type | application/octet-stream |
| Format | Binary |
A DWG file (also known as a Drawing file) is one of the older Computer Aided Design (CAD) formats and is primarily associated with Autodesk's AutoCAD application. The format started out as a format for storing 2D CAD drawings but has evolved to store other CAD-related data, including full 3D CAD models.
The format stores the core CAD data, such as points, lines, elevations, and other 2D and, in more recent versions, 3D modelling data, along with other important metadata related to the drawing. The DWG format is proprietary and is intended for use with the AutoCAD application only.
Although designed for the AutoCAD application, there are other 3D CAD and modelling applications that can open DWG files. As the format is proprietary and has been updated many times over the years, opening a DWG file with any application other than AutoCAD will be met with varying degrees of success.
| Extension | PNG |
| Full Name | Portable Network Graphics |
| Type | Image |
| Mime Type | image/png |
| Format | Binary |
| Opens With | Paint.Net, Photoshop |
PNG files are a widely used graphics file format used in areas where high-quality images (often with transparency) are required while also retaining a small file size. They are one of the most common formats of file used for web and print mediums and are particularly useful for logos, icons, and other images where multi-level transparency is desired.
The format itself was created in the 1990's with the main aim of storing computer graphics in a high-quality format while minimizing the required storage space. The longer-term aim was to displace the GIF file format and make PNG the number one format for non-lossy, high-quality image formats on the then-burgeoning world wide web.
One of the selling points of the PNG format is its support for multiple levels of transparency, making it superior to the GIF format, which can only handle a single level of transparency. Also, like GIFs, the PNG format supports palletizing image colours down to 256 or 16 colours to help reduce the file size of the PNG.
