Opening an ESO File

The ESO file type is primarily associated with EnergyPlus.

ESO	File extension: ESO
	File type:	data file

What is an ESO file?

ESO files mostly belong to EnergyPlus. EnergyPlus Simulation Output: EnergyPlus simulation output files are produced by building energy modeling software. They contain simulation data such as energy use, thermal performance, and environmental impact. For more details, visit the EnergyPlus website.
Spectrograph Data Files:
Some ESO files store observational data from an echelle spectrograph. These files are used with software like ESOWin and ESO-Insight and help manage astronomical observation details.
FoxPro Executable Data:
Another group of ESO files acts as FoxPro related data files. They function as executables within a FoxPro environment and are part of legacy database applications.
Additional Details:

Each file uses a specific data structure based on its origin.

Dedicated software is needed to open and review the content.

The files are not plain text and may require conversion or specialized viewers.

How to open ESO files

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

Online ESO Text Viewer

Choose your .eso file to analyze

or drag and drop it here

Online File Viewer

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ESO format details:

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. File extension, signature and file format must match; otherwise errors will occur when the file is opened. Knowledge is power - this also applies when dealing with unknown or faulty files. In the following you will find our evaluation of the ESO files:

The ESO file extension is rather rarely used and includes different formats for the applicable programs. The two most common formats are as follows:

• 40% of all ESO files use the same file format, which have the signature ESO DATA FILE. They consist of unreadable binary data. The files are 340 KB to 1 MB in size, with a median of 590 KB. The file type was created recently. Several words can almost always be found in the files, e.g. ESO DATA FILE. Some examples of file names are ESOWin_005612_00076005_2020.06.01 10.30.7.eso. Such ESO files store data about originalbilddatei and fotolinie.
• 30% of all ESO files use the same file format, which can be identified by the letters "Program Version,EnergyPlus" at the beginning. If you open these files in a text editor, you can view and read the content yourself. A typical file size is 10 MB. Several words can almost always be found in the files, e.g. 1,5,Environment Title[],Latitude[deg],Longitude[deg],Time Zone[],Elevation[m], YMD, Program Version,EnergyPlus, 2,8,Day of Simulation[],Month[],Day of Month[ and Version 9. Some examples of file names are eplusout.eso. Files like these have the following tags: case and zone.

All other ESO files (30%) have different formats, the following 5 formats exist: ZIP and SQRV. These files are often connected to foxd, annexe or avec. Just click the "Choose your .eso file to analyze" button on this page to find out what your ESO file is.