Opening ISI Files

The ISI file type is primarily associated with Summa Winplot.

ISI	File extension: ISI
	File type:	Cutting instruction file

What is an ISI file?

ISI files mostly belong to Summa Winplot. An ISI file is a specialized cutting data file used to store vector-based instructions for controlling cutting machinery.
It appears in two common forms:

Summa cut file: This type holds detailed cutting instructions from the Summa Winplot system. Use the dedicated Summa software (Summa website) to view and process these files.
i-cut Signmaking Image: This version contains CAD data for sign making. It is designed to work with the i-cut Suite software for precise control of cutting devices.

FilExt.com tip: Using the correct application ensures that the vector paths and cutting commands are properly interpreted so that the machinery operates as intended.

How to open ISI files

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

Online ISI Text Viewer

Choose your .isi file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert ISI files:

Summa Winplot
See the previous paragraphs to learn more about the main application. ISI files are often referred to as Summa Winplot cads because this type of file is primarily created or used by this software.
Summa Winplot
ISI files are primarily associated with the Summa Winplot cutting software. They contain cutting data, such as cut lines, speed, and pressure settings, used by Summa vinyl cutters. While less common, ISI files can also represent I-cut Signmaking Image data used by the i-cut Suite. This file format is classified as CAD.

Technical Data for ISI File Extension

File classification:

CAD

Related files:

plt, hpgl, cut, lsi, wp3, ltp, dxf, svg

an isi Cutting instruction file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with ISI files

Associate the ISI file extension with the correct application.
Update your software that should actually open cutting instruction files. Because only the current version supports the latest ISI file format. Search, therefore, e.g. on the manufacturer website after an available Summa Winplot update.
To make sure that your ISI file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .ISI file online - secure, fast, and no downloads needed.