What is the LED file format?
An .led file defines LED lighting sequences for Sony's classic AIBO entertainment robots. The file specifies color, brightness, and timing patterns for the robot's expressive LEDs - located on the chest, face, tail, and ears - as part of the OPENR behavior system that ran on ERS-110 through ERS-7 model lines.
Classic AIBO robots operated on Sony's proprietary Aperios real-time operating system with the OPENR application layer. Behavior files, including .led sequences, were loaded from a Memory Stick inserted into the robot. Sony provided AIBO Mind and AIBO Life consumer software and the OPENR SDK for third-party behavior development. .mtn files handled motion sequences on the same platform.
The binary format is undocumented and proprietary, specific to individual AIBO model generations (ERS-110/210, ERS-7). File sizes are typically under 10 KB - the data needed to sequence LED states is minimal. No modern tool exists for editing or creating .led files; doing so requires Sony's original OPENR SDK, which targeted Linux cross-compilation.
The classic AIBO line was discontinued in 2006, and Sony ended all repair support in 2014. The 2018 revival (ERS-1000) uses a completely different software stack - LED behavior is controlled via a smartphone app, with no role for .led files.
- The OPENR SDK compiled on Linux and cross-targeted the AIBO's MIPS processor.
- No magic bytes have been documented for this format.
- Windows Media Player does not open
.ledfiles; association claims in some databases are incorrect.
Security & safety
RISK: LOWLED files are passive behavior data for robot hardware. No security risk on a PC.
Format details
in a nutshell- LED Editor project files - Various LED sign/marquee software tools use .led for scrolling text or animation sequences for LED display hardware.
Programs that open LED files
Windows1 app
AIBO Mind / AIBO Life (Sony, discontinued)
Free Historical only: Sony's AIBO management software could load LED behaviors via Memory Stick. No longer available or supported. Technical details
deep spec| Platform | Sony AIBO entertainment robot, ERS-110 through ERS-7 generations |
| Operating environment | Sony Aperios RTOS with OPENR application layer |
| Encoding | Binary (proprietary OPENR/AIBO behavior container) |
| Byte order | Little-endian (assumed) |
| Magic bytes | None publicly documented |
| Typical file size | Under 10 KB |
| Data stored | LED color, brightness, and timing sequences for chest, face, tail, and ear LEDs |
| Delivery medium | Memory Stick (physically inserted into the robot) |
| Generation scope | Varies by AIBO model generation; ERS-110/210 and ERS-7 formats differ |
| Associated OS | Windows (AIBO Mind/Life tools); Linux (OPENR SDK cross-compilation target) |
| Maintenance status | Obsolete - classic AIBO discontinued 2006; Sony support ended 2014 |
| Successor | ERS-1000 (2018) uses smartphone app for LED control; no .led format |
| Released | 1999 (first-generation AIBO ERS-110/ERS-210 era) |
| Latest version | ERS-7M3 era (2005); classic AIBO line discontinued 2006, revived as ERS-1000 (2018) with different software stack |
LED conversions
Community Q&A
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