U3I File Extension

The U3I file extension was created by Developer and is also known as the U3 Application Information File. U3I is classified as a Text Files and This file is saved in an XML structure and its contents can be viewed in a Text Editor. You can open U3I files in Microsoft Notepad program.

U3 Application Information File Type

U3 Application Information File Type
Extension .u3i
Developer Not Available
Popularity 5.0 (1 Votes)
Mime Type mime-type/not.available
Default Program Microsoft Notepad
Category Text Files
Format XML
Updated 6/1/2025

What is a U3I File Type?

U3I files are usually named " Manifest.u3i &" and are used by the U3 launcher to describe U3 applications.

Free Online U3I Tools & Apps

Access powerful and secure free online U3I tools to convert, view, edit, merge, split, and compare U3I files — all without installing any software. Our tools support the .U3I (U3 Application Information File) file extension and run smoothly in any modern browser.

Select a tool below to explore features and manage your U3I files directly from your device with ease.

U3I Files Common Issues

There are few common issues with the U3 Application Information File .U3I File Extensions while opening the .U3I files on Windows and MacOs, we have solution to those issues such as:

Can't Open U3I Files?

  1. You must have supported software programs installed for U3 Application Information File on your system such as Microsoft Notepad.
  2. Associate default Microsoft Microsoft Notepad program for *.u3i (U3 Application Information File) files.


All Platform Software Programs for U3I File Extension

List of all softwares that can open the U3I files on each platforms such as Windows, Mac, iOS, Linux, Web and Android, you may click the each software link for more details for other supported formats for each software and the verified direct download links for each software with complete lisensing details.

Microsoft Windows logo image Open U3I File on Windows

Software License Developer
Microsoft Notepad image. Microsoft Notepad 1903 for Windows Bundled Microsoft
Notepad++ image. Notepad++ 6 for Windows Freeware Notepad Plus Plus

MacOs logo image - FileProInfo.comOpen U3I File on Mac OS

Software License Developer

Linux logo image - FileProInfo.comOpen U3I file on Linux

Software License Developer

Website logo image - FileProInfo.comOpen U3I file on Web

Software License Developer

iOS logo image - FileProInfo.comOpen U3I file on iOS

Software License Developer

Android logo image - FileProInfo.comOpen U3I file on Android

Software License Developer

About Licensing

  1. Free Trial This software are often used for an attempt period, like 14 days, before requiring payment. Some trial versions have a reduced feature set.
  2. Free This software is liberal to use. Examples include open-source , freeware software, like free programs supported by advertising.
  3. Free+ This software is liberal to download and use, but contains in-app purchases (IAP) to unlock additional content or functionality.
  4. Paid This software must be purchased so as to use it. it's going to be offered as a perpetual license or ongoing subscription.
  5. Included with OS This software is bundled with an OS , like Windows, macOS, or Android.

U3I file extension icon image.About U3I - U3 Application Information File

FileProInfo is to help you understand about the U3 Application Information File with *.U3I suffix, and provide the complete detail as how to open, edit, convert, merge, split and compare it with other related software programs, software download links and free online apps and tools.

Our professional team members at FileProInfo have been individually researched and verified the details for U3I. We want to be 100% accurate and publish the information about file formats, tools, apps and software programs that we have tested and validated.

If you would like to suggest any additions or updates to this page for U3I, please let us know.

Updated 6/1/2025