All about CLU Files

The CLU file type is primarily associated with Lua.

CLU	File extension: CLU
	File type:	compiled data file

What is a CLU file

CLU files mostly belong to Lua.

CLU as a Lua Bytecode Compiled Script: These files hold precompiled Lua instructions in a binary format. They run on a Lua interpreter, which reads the bytecode instead of plain text.

CLU as a Game Data File: In some cases (for example in Baldur's Gate) the file stores cluster data for game assets. This type is used by the game engine to organize data. More details are available at D&D Beyond.

CLU as an Infomap Clustering Output: These files are generated by the Infomap tool to group network nodes into clusters. They serve as output data for further analysis. See Infomap for related info.
FilExt.com tips: To open a CLU file, you must know its origin. For Lua bytecode, use a Lua interpreter or decompiler. For game data, the corresponding game engine or mod tools are needed, and for a clustering output, a text editor or analysis software will help view the content.

How can I open a CLU file?

You need a suitable software like Lua to open a CLU file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CLU file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CLU file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CLU Text Viewer

Choose your .clu file to analyze

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Online File Viewer

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Programs that open and convert CLU files:

Lua
See the previous paragraphs to learn more about the main application. CLU files are often referred to as Lua data files because this type of file is primarily created or used by this software.
Broken Sword 2 (Dialog File) by THQ Inc.
This file is typically called TEXT.CLU and is located in the clusters folder. This file format is classified as Game.
CLUCalc (Geometric Algebra Description (CLUScript File)) by Christian Perwass
CLUCalc (visual Clifford algebra calculator) is a freely available software tool for 3D visualizations and scientific calculations that was conceived and written by Dr. Christian Perwass. CLUCalc interprets a script language called CLUScript, which has been designed to make mathematical calculations and visualizations intuitive. This file format is classified as Source Code.
Clusse (Node File) by Heikki Hannikainen
Clusse is a free DX cluster server software package for amateur packet radio.
IBM PCI Cryptographic Coprocessor (Code File) by IBM
Phantasmagoria 2
Any .CLU file with a number is the pallete for that particular movie, with the exception of 999.CLU which is a generic pallete file for those movies which don't have a specific .CLU file.
XNBC V8 Biological Neural Network Simulation Workstation
The .CLU file contains the cluster names used by a network. Related links: XNBC V8 User Manual

CLU file format:

Each file has a definite file format, that is, how the stored data is arranged in the file. The file format can be determined based on the file extension and the signature (the first few characters of a file). If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. So you need a detailed analysis of a file to find out the format and the associated program. Below is our analysis of the CLU files:

CLU is not a commonly used file extension and does not have a uniform file format. The two most common formats are as follows:

10% of all CLU files use the same file format, which can be identified by the letters "1B 4C 75 61" at the beginning. The contents of these files cannot be read by a human; only a computer program can interpret the data. The files are often between 200 bytes and 9 KB in size. The files contain the following words: LuaQ. The file name QuestionDifficulty.clu or QuestionReveals.clu is typical for these files. These files are attributed to support, round, question, code and quiz.
9% of all CLU files have the same signature CLU. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. Most of these files are 220 bytes to 120 MB in size. MUSIC.CLU or speech.clu is a typical file name.

The remaining 81% of all CLU files are different files with different signatures, often e.g. RIFF, XML, ChrTxt, Vertices, NORMAL, Sprite and lText. Tagged as camera, license, update, conf, year, collector, english, medulla, carib, korea, yeast, gold, lcpm, norm, sets, tcga or ucec. You can get all the details of your CLU file by dragging it onto this page or by clicking the button "Choose your .clu file to analyze" above.

Technical Data for CLU File Extension

File classification:

Data

Related files:

lua, lub, clx, clt, vfs, dat, cff, spd, xld, bin, txt

a clu compiled data file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CLU files

Associate the CLU file extension with the correct application.
Update your software that should actually open compiled data files. Because only the current version supports the latest CLU file format. Search, therefore, e.g. on the manufacturer website after an available Lua update.
To make sure that your CLU file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CLU file online - secure, fast, and no downloads needed.