ONB File Extension

What is ONB file?

ONB is a file extension commonly associated with OpenModelica Document Format files. Files with ONB extension may be used by programs distributed for Windows platform. ONB file format, along with 6033 other file formats, belongs to the Misc Files category. OpenModelica is by far the most used program for working with ONB files.

Programs which support ONB file extension

Below is a table that list programs that support ONB files. Files with ONB extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

Updated: 02/22/2020

How to open file with ONB extension?

There can be multiple causes why you have problems with opening ONB files on given system. On the bright side, the most encountered issues pertaining to OpenModelica Document Format files aren’t complex. In most cases they can be addressed swiftly and effectively without assistance from a specialist. The following is a list of guidelines that will help you identify and solve file-related problems.

Step 1. Install OpenModelica software

The main and most frequent cause precluding users form opening ONB files is that no program that can handle ONB files is installed on user’s system. The solution to this problem is very simple. Download OpenModelica and install it on your device. Above you will find a complete listing of programs that support ONB files, classified according to system platforms for which they are available. The safest method of downloading OpenModelica installed is by going to developer’s website () and downloading the software using provided links.

Step 2. Verify the you have the latest version of OpenModelica

You still cannot access ONB files although OpenModelica is installed on your system? Make sure that the software is up to date. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. The reason that OpenModelica cannot handle files with ONB may be that the software is outdated. The latest version of OpenModelica should support all file formats that where compatible with older versions of the software.

Step 3. Assign OpenModelica to ONB files

If you have the latest version of OpenModelica installed and the problem persists, select it as the default program to be used to manage ONB on your device. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.

Selecting the first-choice application in Windows

• Clicking the ONB with right mouse button will bring a menu from which you should select the Open with option
• Click Choose another app and then select More apps option
• The last step is to select Look for another app on this PC option supply the directory path to the folder where OpenModelica is installed. Now all that is left is to confirm your choice by selecting Always use this app to open ONB files and clicking OK.

Selecting the first-choice application in Mac OS

• From the drop-down menu, accessed by clicking the file with ONB extension, select Information
• Open the Open with section by clicking its name
• Select OpenModelica and click Change for all...
• A message window should appear informing that This change will be applied to all files with ONB extension. By clicking Continue you confirm your selection.

Step 4. Ensure that the ONB file is complete and free of errors

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper ONB file. Problems with opening the file may arise due to various reasons.

1. Verify that the ONB in question is not infected with a computer virus

If the file is infected, the malware that resides in the ONB file hinders attempts to open it. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. If the ONB file is indeed infected follow the instructions below.

2. Ensure the file with ONB extension is complete and error-free

Did you receive the ONB file in question from a different person? Ask him/her to send it one more time. During the copy process of the file errors may occurred rendering the file incomplete or corrupted. This could be the source of encountered problems with the file. When downloading the file with ONB extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Verify whether your account has administrative rights

Sometimes in order to access files user need to have administrative privileges. Switch to an account that has required privileges and try opening the OpenModelica Document Format file again.

4. Check whether your system can handle OpenModelica

If the system is under havy load, it may not be able to handle the program that you use to open files with ONB extension. In this case close the other applications.

5. Ensure that you have the latest drivers and system updates and patches installed

Latest versions of programs and drivers may help you solve problems with OpenModelica Document Format files and ensure security of your device and operating system. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle ONB files.

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