The .thumb file extension is used for a bitmap image file format, which was developed by JAlbum Software. These THUMB files are also known as JAlbum thumbnail files, which are generated by the JAlbum application. This software was also created by the same company that developed the .thumb file format.JAlbum is a photo gallery management program that was designed for Windows PCs. This software can be used to create photo albums, which can allow users to browse through several digital photos at a time through the thumbnails that are generated by this program. These THUMB files contain smaller versions of the original digital photos saved by the user in a photo album that was created through the JAlbum software.These .thumb files are not meant to be opened and viewed in digital photo viewers and photo editing applications. It's recommended to leave these THUMB files alone, in order for the JAlbum software to continue working properly.
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