Standard factory file managers usually fail to open these files, but advanced, developer-focused file managers often feature built-in archive and database viewers.

Because thumbs.db is a Windows format, Windows is still the best tool for viewing it. If you only need to check a few files and the Android apps are crashing or not working:

While few apps specifically target the Windows Thumbs.db format, you can use general utility apps to find or recover cached images.

thumbs.db files contain thumbnails , not full-resolution images. Expect low-resolution pictures (typically 100 × 100 or similar).