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.db

File Type 1 Database File IconDatabase File
File Format Standard
Usage Open manually; may be referenced by an application
Popularity ★ ★ ★ ★ ★  Popular
Description

Generic database file that stores information in a structured format; might be created by a number of different database programs; may also be imported by multiple database programs.

Open With
Windows

IconMicrosoft Access

IconLibreOffice

IconSynopsys Design Compiler Graphical

macOS

IconSQLite

IconSQLite Database Browser

IconLibreOffice

Unix

IconSQLite

IconSQLite Database Browser

IconLibreOffice

Published 2007
File Type 2 Generic IconWindows Thumbnail Cache
File Format Standard (developed by Microsoft)
Usage Referenced by an application; not meant to be opened manually
Popularity ★ ★ ★ ★ ☆  Common
Description

Files named Thumbs.db are image cache files created by Windows. They store small versions of the images contained in the folder.

Thumbs.db files help speed up image browsing within a folder, since the image thumbnails don't have to be recreated each time the folder is opened. These files are hidden by default, but may be seen if the "Show invisible files" option is checked in the "View options" window.

Open With
Windows

IconMicrosoft Windows

Published May 6, 2009
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Information from the PC File Extensions Reference
https://pc.net/extensions/db
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