What is an ICHAT file?
An .ICHAT file is an iChat Saved Chat Log created by Apple software. These files contain the history of instant messaging conversations. They store text messages, timestamps, and participant details from older Apple iChat sessions or the modern Apple Messages application.
Internally, most .ICHAT files use the plist (Property List) structure. A small number of older files might use the legacy Mac2OSX format. Depending on the software version, the plist can be saved as readable XML text or compressed as a binary file.
How to open ICHAT files?
If you use a Mac computer, you can usually open .ICHAT files directly with the native Apple Messages app. Because the files rely on the plist architecture, developers can also inspect them using Xcode or a basic text editor like TextEdit.
Opening these files on Windows or Linux is more difficult because those operating systems do not have native Apple software. You often need a dedicated plist viewer or a conversion tool.
Software and tools
Advanced users on macOS can use the terminal command `plutil` to interact with .ICHAT files. This command-line tool can convert a binary plist file into a readable XML format. For example, running `plutil -convert xml1 filename.ichat` makes the file readable in any text editor.
Best practices and troubleshooting
If you find an old .ICHAT file and do not have access to a Mac, do not try to force it open with a standard word processor. This can corrupt the binary data. Instead, use a dedicated inspection tool.
viewer.online/ichat analyzes .ICHAT files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. If an .ICHAT file has multiple possible meanings or versions, viewer.online/ichat helps identify the actual format of the user's file.
Summary
Because .ICHAT files use the known plist format, viewer.online/ichat can safely open and display them online, eliminating compatibility problems.