When you save a file in Paintbrush, the default extension given to the file is .bmp. This stands for Bitmap Image file, which is a common format used for saving images on Windows computers. The .bmp extension is used to indicate that the file is a raster graphics image file, meaning that it is made up of pixels arranged in a grid.

Bitmap images are a popular choice for saving images because they are easy to edit and can be used in a wide variety of applications. However, they can also be quite large in size, so it's important to consider the file size when saving images in this format. You can use image editing software like Paintbrush to resize and compress bitmap images to make them more manageable.

If you want to learn more about bitmap images and the .bmp file extension, you can check out the following resources:

• Wikipedia page on BMP file format
• Fileinfo.com page on .bmp file extension
• Adobe Photoshop software for editing bitmap images

By understanding the default extension given to Paintbrush files, you can better manage and work with bitmap images on your computer. Whether you're a graphic designer, web developer, or just someone who enjoys creating digital art, knowing how to save and edit bitmap images can be a valuable skill to have. So next time you save a file in Paintbrush, remember that it will be saved with the .bmp extension!

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