BTM File

What are BTM files and how to open them

Are you having problems opening a BTM 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 BTM files.

What is a BTM file?

BTM files have multiple uses, and 4DOS Compressed Batch-To-Memory is one of them. Read more about the other uses further down the page.

4DOS Compressed Batch-To-Memory File

4DOS batch‐to‐memory files are scripts designed for the 4DOS command interpreter. They are text files placed into memory entirely before execution, rather than being read and executed line-by-line like traditional DOS batch files. Because they run from RAM, they execute faster - often two to five times faster than ordinary batch files.

These files are created by a user writing a batch script under 4DOS and saving it with the batch-to-memory format. Once loaded, the whole file is kept in memory even while running, so the batch can continue even if the original disk or drive is removed. They are not suitable for scripts that modify themselves while running. Also, memory-resident programs (TSRs) should generally not be loaded from within them, as releasing memory later may leave unused gaps.

There is a size limit: the entire file must not exceed 64 kilobytes. If it does, 4DOS will not support turning it into a batch-to-memory file. Also, when converting or using these files, the variable %0 still returns the batch file name exactly as typed on the command line and in uppercase, for compatibility with COMMAND.COM behavior.

How to open BTM files

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

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 25, 2026

All known file formats using extension .BTM

While 4DOS Compressed Batch-To-Memory File is a popular type of BTM-file, we know of 2 different uses of the .BTM file extension. Different software may use files with the same extension for different types of data.

BambooTracker Module

A BambooTracker Module file stores a complete song composed in BambooTracker, a music tracker for the Yamaha YM2608 (OPNA) sound chip originally used in NEC PC-8801/9801 computers. It captures all information needed to replay a song: patterns (sequences of musical notes and effects), instrument definitions (including FM, SSG, and ADPCM instruments), song order (which patterns play in which order), groove/rhythm settings, and metadata. It is used when composing, editing, saving, or exporting complete songs in BambooTracker.

BambooTracker produces these module files. Once saved in this format the songs can be loaded back later in BambooTracker for editing or playback, or exported from them into audio formats like WAV, or tracking chip-sound formats like VGM and S98. Version-compatibility is maintained via specifications: module‐specification documents are versioned (e.g. mod_specs v1.6.1) and files record internal version info so that newer versions of BambooTracker can correctly read older module files, sometimes with adjustments to deprecated or changed features.

Internally a BambooTracker Module file begins with the ASCII signature "BambooTrackerMod" at byte offset 0, followed by binary data that includes strings like INSTPROP, INSTRMNT, GROOVE, MODULE, and SONG as field identifiers. These keywords appear in predictable positions in the file structure and help distinguish module files from other file types.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

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