Opening a TLM File

The TLM file type is primarily associated with X-Plane, OpenTX, TLM Editor.

TLM	File extension: TLM
	File type:	log file

What is a TLM file

TLM files mostly belong to X-Plane, OpenTX, TLM Editor. TLM files are used in various fields. In many cases, they are telemetry log files that record live data.
For example, one group of these files holds X-Plane flight telemetry data which tracks speeds, altitudes, and sensor details. Another group records RC flight data from devices running OpenTX.
Additionally, a minority of TLM files are used in Slovakia as a tax document format, managed by the TLM Editor.
Key details as outlined by FilExt.com:

• Telemetry Logs: Capture performance and sensor data from flight simulators or RC aircraft.
• Transaction Level Modeling: Some files log the steps of technical processes.
• Slovak Tax Documents: A distinct use case where the format holds tax information.

FilExt.com notes: To view these files, use the software that matches its origin. For flight and RC logs, programs like X-Plane or OpenTX log viewers are needed. For Slovak tax files, the TLM Editor is appropriate. More details about flight telemetry can be found at the X-Plane website.

How to open TLM files

You need a suitable software like X-Plane, OpenTX, TLM Editor to open a TLM 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 TLM file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a TLM file directly in the browser:. Just drag the file onto this browser window and drop it.

Online TLM Text Viewer

Choose your .tlm file to analyze

or drag and drop it here

Online File Viewer

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TLM file format:

To find out what program is needed to open TLM files, you need to determine the file format. The file format can be deduced from the file extension and the signature. However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our analysis of the TLM files produces the following result:

TLM is seldom used as a file extension and is used by a few programs, each with its own file format. However, the following two file formats are common:

• 30% of all TLM files start with the bytes 00 01 00 00 FA 00 00 00 C0, which are crucial for this file format. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. Most of these files are 47 KB to 460 KB in size. The file type was developed 20 years ago and is still in use today.
• 20% of all TLM files have the same signature 01 00 00 00. They consist of unreadable binary data. Most of these files are 1 KB to 740 KB in size. The keywords Application, IBM10.0_64_64bit, CPU8Intel Core, 0 GHz - Cores, Speed: 3.6-4.0 and VersionNX-Plane 11.55r2 (build 115501 64-bit c22f0eb21d049f66fcba233c37e65c845605fc40) are typical for these files. A usual file name is telemetry_0.tlm or telemetry_1.tlm.

All other TLM files (50%) have no uniform format. Tagged as acro. If you want to find out what your TLM file contains, drag and drop it onto this page.