There are 7 other file types using
the CLS file extension!

empty icon.cls - ArcView geocoding classification

empty icon.cls - JavaScript class definition

cls icon.cls - Microsoft Visual Basic 4 class module add-in

cls icon.cls - Microsoft Visual C++ class definition

cls icon.cls - AIM AOL Instant Messenger data

empty icon.cls - LaTeX data

empty icon.cls - Java class definition

CLS file extension - SQLite 3 data format

What is cls file? How to open cls files?

File type specification:

Database file type icon Database file type

The cls file extension is related to the SQLite, a relational database format.

The format used by SQLite database files has been completely revised. The old version 2.1 format and the new 3.0 format are incompatible with one another.

The new database file format uses B+trees for tables. In a B+tree, all data is stored in the leaves of the tree instead of in both the leaves and the intermediate branch nodes. The use of B+trees for tables allows for better scalability and the storage of larger data fields without the use of overflow pages. Traditional B-trees are still used for indices.

The new file format also supports variable pages sizes between 512 and 32768 bytes. The size of a page is stored in the file header so the same library can read databases with different pages sizes, in theory, though this feature has not yet been implemented in practice.

The default software associated to open cls file:

SQLite icon

SQLite Development Team logoSQLite  Microsoft Windows software

Company or developer:
SQLite Development Team

SQLite is embedded relational database management system used by many applications for storing databases.

It is a compact library and all database data are stored in single disk file.

SQLite databases uses for example Firefox, Thunderbird, Skype, Opera as well as is integrated in iOS, Symbian OS, Google Android, MeeGo and other Unix-based operating systems.

SQLite for Mac icon

SQLite Development Team logoSQLite for Mac  Apple macOS / Mac OS X software

Company or developer:
SQLite Development Team

SQLite for Mac is a in-process library that implements 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.

SQLite for Linux icon

SQLite Development Team logoSQLite for Linux  Linux/Unix software

Company or developer:
SQLite Development Team

SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain.

Help how to open:

Use compatible tools to work with *.cls files.

How to convert:

Probably can be exported to other formats.

List of recommended software applications associated to the .cls file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open cls file, edit cls file, convert cls file, view cls file, play cls file etc. (if exist software for corresponding action in File-Extensions.org's database).

Unspecified and all other actions for computer programs working with cls file - SQLite 3 data format

Click on the software link(s) for more information. Suggested software applications use cls file type for internal purposes and/or also by different way than common edit or open cls file actions.

Microsoft Windows:

Apple macOS / Mac OS X:

Linux/Unix:

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