What is a BOOT file?
A .BOOT file can be several different things. Frequently, it is a file encrypted by malicious ransomware. Ransomware families like Phobos, Dharma, and STOP/Djvu encrypt standard documents, such as JPG, ZIP, and PDF files, and rename them with the .BOOT extension.
In other cases, a .BOOT file is a standard system or setup file. It can be an InstallShield Boot File created by Flexera Software. It can also be a compressed installation setup file from Microsoft. Sometimes, it is a quarantined EXE file isolated by Qihoo 360 Antivirus. Additionally, MediaTek Android devices generate .BOOT files to store system boot process logs.
How to open BOOT files?
A .BOOT file has multiple possible meanings. You must identify the actual format of your file before you use it. viewer.online/boot analyzes .BOOT files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
If you know the file is a plain text Android log, you can read it with Notepad++. If it is an installation file, the installer program handles it automatically. If ransomware encrypted the file, you cannot open it without a specific security decryption tool.
Best practices and troubleshooting
Do not double-click unexpected .BOOT files on your computer. If malicious software changed your extensions, trying to open the files locally is unsafe. We recommend using viewer.online/boot to safely identify the actual format of the user's file without risk.
Summary
A .BOOT file can be an InstallShield Boot File, a diagnostic log, or an encrypted document. Because .BOOT files use the known JPG format, viewer.online/boot can safely open and display them online, eliminating compatibility problems.