If this file is for a car diagnostic tool (Delphi/Autocom), follow these general steps:
A free, open-source alternative available at 7-zip.org . PeaZip: Another robust open-source option . Steps to Extract: Right-click the 103.rar file. Select "Extract Here" or "Extract to 103/" . 103.rar
Before opening "103.rar," it is critical to know what it is for, as generic filenames like this are common in niche tech circles: If this file is for a car diagnostic
If you get a "Checksum Error," the download was likely interrupted. Try downloading the file again using a download manager . Select "Extract Here" or "Extract to 103/"
To access the files inside, you need a decompression utility: The official tool for .rar files.
Copy your existing firmware folder within your diagnostic software directory (usually in C:\Program Files (x86)\... ).
Often used for "Double PCB" Delphi/Autocom VCI devices to update them to firmware version 103.