Opening a SU File

The SU file type is primarily associated with Apple II operating system.

SU	File extension: SU
	File type:	Golden Orchard Apple II CD Rom file

What is a SU file

SU files mostly belong to Apple II operating system. Use our "Online SU Text Viewer" below to analyze your SU file and to see all text it contains.

How to open SU files

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

Online SU Text Viewer

Choose your .su file to analyze

or drag and drop it here

Online File Viewer

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.SU File Not Opening? How to Fix It:

SU files come from different programs and aren't universally openable.

1. Identify the Source: These often originate from retro computing or geophysics, suggesting the Apple II operating system (Golden Orchard Apple II CD Rom file) or Seismic Unix.
2. Check the Header: Open the file in a hex viewer to inspect the first bytes:
   • "Apple" or specific magic bytes may indicate an Apple II disk image.
   • Unreadable binary data often implies a Seismic Unix dataset.
3. Use the Original Software: The original program is usually required; try Apple II emulators or Seismic Unix tools, and ask the sender if uncertain.
4. Use this Webpage: Drag and drop your .SU file into our viewer to detect its format, extract metadata, and preview contents.

SU file format:

If you can determine the file format, the associated program can also be determined. The initial characters of a file are called signature, sometimes also referred to as "magic bytes". The signature can be used to infer the file format. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. When there is a problem with a file, the first step to solving it is to determine the file format. Our analysis of the SU files produces the following result:

SU is seldom used as a file extension and includes a lot of different file formats for different programs. The two most popular formats are as follows:

• 10% of all SU files save the data in ELF file format. ELF is the abbreviation for Executable and Linkable Format and is the standard binary format on Linux and Unix. They consist of illegible, cryptic characters. The average file size is 75 KB with most files being between 22 KB and 160 KB in size.
• 9% of all SU files are based on the popular .NET file format. The .NET format is used to save Microsoft .NET Framework objects to a file (ex. save game state as file) via object serialization. Such a .NET object may contain functions and data like settings, images or videos. The contents of these files can even be read by a human. The files are on average 240 KB in size and range from 220 KB to 370 KB. The files contain the following words: TL01gch770dXFivHE73afhQDXWxs7ri8j9r1JAYzOScLv8NbrLTwLsG8EVVzdz0h, VPwuo, VTajau and w8VSSYkBKPtOA3al2mb9VDjRB6Qg3MA0o2q0g. A common filename is sisf.su or mak.su.

All the rest of the SU files (81%) have different formats, frequently e.g. Salted. The category is dnmx, loptr, data, single, utilities, locales, config, origen, shoot, easy, topo or xlsx. If you want to find out what your SU file contains, drag and drop it onto this page.