Opening SOF Files

The SOF file type is primarily associated with Quartus Prime.

SOF	File extension: SOF
	File type:	configuration file

What is a SOF file?

SOF files mostly belong to Quartus Prime. SOF files are mostly used as FPGA configuration files with Quartus Prime. They hold the bitstream data that programs an FPGA to perform a specific function.
Other uses include:

XML-based Data Files: Some SOF files use XML formatting. These files, handled by applications like MAGICapp, contain organized data. For more details, visit MAGICapp info.

Game Data Files: A few instances serve as game data, as seen in the Star Ocean series where they also act as executable elements for configuring hardware.

Zipped XML Forms: Certain SOF files are compressed versions that include XML form data, used in contexts such as Xilinx FPGA configuration.

FilExt.com notes: If you have a SOF file, use the appropriate tool. For FPGA configuration, open it with Quartus Prime. If it is XML-based, a text or XML editor will let you view its content.

How can I open a SOF file?

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

Online SOF Text Viewer

Choose your .sof file to analyze

or drag and drop it here

Online File Viewer

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SOF file format details:

The file format determines how the data is stored in the file. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our evaluation of the SOF files looks like this:

The file type with the extension 'SOF' mainly uses a defined SOF format. The file formats most commonly found in SOF files are:

• 75% of all SOF files are Quartus II Project files. They consist of unreadable binary data. The average file size is 1 MB with most files being between 450 KB and 6 MB in size. It is a modern file type. Several words can almost always be found in the files, e.g. Build, Untitled, Compiler Version, Quartus Prime and Lite Edition. Files like these are about demo, project, testing, lite, solution, toplevel, nano and time.
• 3% of all SOF files use the popular XML file format. The Extensible Markup Language (XML) is a simple text-based format for representing structured information: documents, webpages, data, configuration, books, transactions, invoices, and much more. XML defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. These files are text files and can therefore be read using a text editor. The files are on average 15 KB in size and range from 190 bytes to 23 KB. The following keywords are characteristic: <?xml version="1.0" encoding="utf-8"?>.

The remaining 22% of all SOF files are files with no common format, the following 4 formats can be found: ZIP. Tagged as control, limited, edupow, switch, clock, delay or panel. Just click the "Choose your .sof file to analyze" button on this page to find out what your SOF file is.