ICS File

What are ICS files and how to open them

Are you having problems opening an ICS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your ICS files.

What is an ICS file?

ICS files have multiple uses, and Calendar Entry is one of them. Read more about the other uses further down the page.

Calendar Entry File

Files that contain the .ics file extension are created by a variety of calendar and scheduling applications. .ics files are also referred to as vCalendar files and are most commonly used to send meeting requests to participants, who can have the meeting date automatically entered into their calendar when accepting the request.

The files are text files that can be inspected with any text editor.

Storing a .ics file on your website makes it possible to have, e.g., event dates easily entered into visitor calendars by having them click the file link.

Some of the applications that use the .ics file extension include Apple's iCalendar, IBM Lotus Notes, and Microsoft's Outlook email and calendar application.

How to open ICS files

We have identified two ICS openers that are compatible with this specific type of ICS file.

Programs that open Calendar Entry files

Last updated: January 22, 2025

All known file formats using extension .ICS

While Calendar Entry File is a popular type of ICS-file, we know of 3 different uses of the .ICS file extension. Different software may use files with the same extension for different types of data.

Image Cytometry Standard Header

We know that one ICS format is Image Cytometry Standard Header. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

While we have not verified the apps ourselves yet, our users have suggested ten different ICS openers which you will find listed below.

IronCAD 3D Scene

We know that one ICS format is IronCAD 3D Scene. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Various apps that use files with this extension

These apps are known to open certain types of ICS files. Remember, different programs may use ICS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about ICS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.