BTL File

What are BTL files and how to open them

Are you having problems opening a BTL file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your BTL files.

What is a BTL file?

BTL files have multiple uses, and Flight Commander 2 Battle Data is one of them. Read more about the other uses further down the page.

Flight Commander 2 Battle Data

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open BTL files

Important: Different programs may use files with the BTL file extension for different purposes, so unless you are sure which format your BTL file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested three different BTL openers which you will find listed below.

Last updated: August 25, 2026

All known file formats using extension .BTL

While Flight Commander 2 Battle Data is a popular type of BTL-file, we know of 3 different uses of the .BTL file extension. Different software may use files with the same extension for different types of data.

Link Bootable Code For Transputer Network

Link Bootable Code For Transputer Network is an executable format used in the INMOS Transputer toolset for booting programs across one or more Transputer processors connected by network links. It contains self-booting code that includes bootstrap routines and routing information so that the Transputer network (or a single Transputer unit) can be loaded and started directly from a host system through link-interfaces.

The format is produced by the collector utility named icollect, which takes configuration files (for networks) or linked units (for single-processor programs), combines them with bootstrap and loader code, and outputs the executable file. Then the file server loader tool iserver reads this output, transfers it over host-link connections to the network (or root processor), resets the target hardware, and causes the program to start running. The same bootable file can also be used for debugging with additional tools like inquest.

Internally the file begins with a byte signature at offset zero that includes a 32-bit magic number and bootstrap/link loader code specific to Transputer network format. The first bytes follow this pattern (shown in hex) beginning at offset 0: F0 B4 D1 D1 D1 D1 24 F2 71 E0 24 F2 21 FC 24 F2 21 F8 61 4C 21 FB D0 16 23 FF F0 C0 C0 F5 23 F4 D4 4E 21 FB D5 75 74 75 FC D5 75 74 F0 24 FA 74 F6 20 74 75 F5 23 FF F0 C0 C0 F5 23 F4 23 FC 60 BA 28 0F 20 20 20 00 00 00 00 74 25 44 C0 1 … In ASCII some of this appears as portions of "BTL".

The Civil War Battle Data

The Civil War Battle Data files are used by the game The Civil War (1995) from Dagger Interactive Technologies to store scenario‐level battle information. Each file represents all the static configuration needed to set up a historical battle in the game - including terrain layout, unit types involved, starting positions, and possibly objectives. These files are created by the game and read when a historical battle scenario is selected or loaded during play.

These files are binary format rather than plain text. They sit in the game's data directory (often under a "GAMEDATA" folder) alongside other assets such as animations, maps, and sprites. The Civil War writes these files when packaging the battle scenarios and reads them at runtime to initialize battles, displaying the proper order of battle, map layout, and all relevant unit and command information.

Internally, these files can be recognized by certain byte sequences. They begin with a signature around the very start: the ASCII string "CFRR" followed by several version and header fields, then "Battle Game", then much padding before the substring "LTAB\0…PAMBe…TABO" appears. Another identifier .SBOS appears near offset 79. The content also includes text strings like "ARMY OF", "BATTERY", and "IANA" embedded among its data.

Various apps that use files with this extension

These apps are known to open certain types of BTL files. Remember, different programs may use BTL files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about BTL file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.