application/x-sqlite3

This mimetype is deprecated. You should still support it, but avoid using it to assign new mimetypes.
Instead, please use application/vnd.sqlite3

SQLite is a self-contained, serverless, zero-configuration, transactional SQL database engine. The code for SQLite is in the public domain and is thus free for use for any purpose, commercial or private.

File types

.db
.db-shm
.db-wal
.sqlite
.sqlite-shm
.sqlite-wal
.sqlite3

Also appears as

Further reading

  1. Internet Assigned Numbers Authority (IANA)
  2. Let's Solve the File Format Problem!