These files are not actual images. They are databases containing compressed image data (usually in JPEG format). To view them, you need a tool that can "extract" the thumbnails hidden inside the database.
X-plore is a popular file manager that offers a paid add-on to view database files. It is user-friendly for beginners who don't want a forensic tool but just want to see what is inside a Thumbs.db file. thumbs db viewer android
Thumbs.db file in res/drawable/hdpi folder - android - Stack Overflow These files are not actual images
While primarily a Windows tool, the Android port of is the gold standard. It allows you to browse the internal database, extract JPEG thumbnails, and even view image dimensions. X-plore is a popular file manager that offers
is an OLE Compound File (similar to Microsoft Office formats), Android cannot open it natively. To view the contents, you typically have two paths: