RIO file format description

Many people often share .rio files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .rio files. To address this issue, we have created this page to offer assistance and guidance on handling .rio files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .rio files.

Our aim is to simplify the process and promote seamless use of the .rio file format.

2 filename extension(s) found in our database.

.rio - OMICRON Test Universe RIO Object

The RIO data files are related to OMICRON Test Universe. The RIO file is an OMICRON Test Universe RIO Object. Test Universe is the most powerful and convenient software tool for parameter related testing of protection and measurement devices in power systems. The term RIO stands for Relay Interface by OMICRON.

Application:OMICRON Test Universe
Category:Data files
Magic:- / -

OMICRON Test Universe RIO Object related extensions:

  • adt ABBYY Lingvo Custom Dictionary Text
  • bdt ABBYY Lingvo Dictionary Text
  • awe Adobe Acrobat Bookmark XML Data
  • dbo DB/TextWorks Database Directory
  • mmt CoCo Systems VisiMap Template
  • nfr CONTAM Node Flow Results Data

.rio - IBM AIX System Data

The RIO development files are related to IBM AIX. The RIO file is an IBM AIX System Data. AIX (Advanced Interactive eXecutive) is a series of proprietary Unix operating systems developed and sold by IBM for several of its computer platforms.

Application:IBM AIX
Category:Development files
Magic:- / -

IBM AIX System Data related extensions:

  • jld Julia HDF5 Data
  • t6m Matrix Mazatrol Program
  • fi Fortran Interface File
  • rms Retek Merchandising System Settings
  • frpg Flowgorithm Internal XML Data
  • pkb Oracle Package Body

Be careful.

It is important to understand that the .rio file extension is not limited to a particular set of applications. Other programs besides the intended ones can also use the .rio extension to create files. This includes potentially harmful programs or malware that may generate .rio files for various purposes. Be especially cautious with .rio files coming from untrusted or unknown sources.

Can't open a .rio 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 an extension, you receive the following message:

Select an app to open this .rio file

To set the .rio file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. Under the Default apps section, you will find various categories such as Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate, such as Photos for image files or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the desired app is not listed, click on More apps to see additional options or click on Look for an app in the Microsoft Store to search for apps in the Store.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set .rio file association. Many applications can open .rio files without requiring any specific file association to be set.

The .rio file extension is often given incorrectly

Based on searches conducted on our site in the past year, we have compiled a list of the most common misspellings. These frequent misspellings can cause confusion and hinder search accuracy. Our goal in providing this list is to help users find the right information more easily and enhance their overall search experience on our website.

These misspellings were the most common in the past year:

dio, eio, fio, gio, io, ri, rik, ril, rip, rlo, ro, roi, roo, tio

Is it possible that the filename extension is misspelled?

There is a possibility that the .rio filename extension is misspelled. To assist users in identifying potential errors, we provide a list of similar file extensions in our database.

Filename extensions similar to .rio:

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

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

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