IES file format description

Many people share .ies files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .ies file can be edited, converted or printed with. On this page, we try to provide assistance for handling .ies files.

1 filename extension(s) found in our database.

.ies - IESNA Photometric Data

The IES data files are related to Lithonia Photometric Viewer. The IES file is an IESNA Photometric Data. The Illuminating Engineering Society of North America (IESNA) is a non-profit, learned society founded in New York City on January 10, 1906. The Society's stated mission is to improve the lighted environment by bringing together those with lighting knowledge and by translating that knowledge into actions that benefit the public.

Lithonia Photometric Viewer
Data files
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IESNA Photometric Data related extensions:
BBEdit Dictionary Data
Business Plan Pro Plan
Warajevo Emulator Data
STK Interval List File
PC-9801 FM System Data
NEPLAN DOS Export Data

Naturally, other applications may also use the .ies file extension. Even harmful programs can create .ies files. Be especially cautious with .ies files coming from an unknown source!

Can't open a .ies file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .ies file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

eis, es, i3s, ids, ie, iec, iex, ifs, irs, is, ise, iss, iws, jes, kes

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

EIS Spectrum Analyser Project
InfoSlips Package
Infinity Engine Text Based Lookup Table
FractInt IFS File
Mklesson Lesson File
Internet Explorer Converter

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

If you find the information on this page useful, please feel free to link to this page.

If you have useful information about the .ies file format, then write to us! >> IES file