MD0 files are cache files for the metadata of the file browser of the image processing software Adobe Photoshop. The Photoshop File Manager can be used for image surveys and offers some simple image manipulation options such as rotate. Furthermore, images can be specially marked or sorted.
These changes are only temporary. To save these settings, you can create an MD0 file via 'File -> export cache' in the file browser. In addition to the MD0 file further tb0 (for thumbnails / thumbnails) files are generated. In this way you can save these settings and also the thumbnails are loaded faster.
When these files are placed in the folder containing the related images, the settings are used when viewing the folder in the file browser.
It should be noted that the file browser is now included under the name Adobe Bridge Photoshop CS. Adobe Bridge stores this cache information in files with the suffix bc and bct.