VDM File Extension

What is VDM file?

VDM is a development file format used for storing source code written in VDM-SL or VDM++ programming language. VDM is a text file and can be easily edited using a text editor of choice. VDM files store code that describes a model of computing system. Using VDM project files allows designers to get a high-level view of the system, which is more difficult be only perusing the source code. VDM files can be used as templates for generating code components.

Vienna Development Method

VDM standard was developed in the 1970s and is one of the oldest format methods for the development of computer systems. VDM-SL was further enhanced to support objects resulting in the creation of VDM++ standard, which also used the VDM files. VDM language is used for developing operating system, compilers, and real-time computing systems.

Programs which support VDM file extension

The list that follows enumerates programs compatible with VDM files, divided into 3 categories based on operating system on which they are available. VDM files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

Updated: 12/15/2022

How to open file with VDM extension?

There can be multiple causes why you have problems with opening VDM files on given system. Fortunately, most common problems with VDM files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. We have prepared a listing of which will help you resolve your problems with VDM files.

Step 1. Get the VDMTools

The main and most frequent cause precluding users form opening VDM files is that no program that can handle VDM files is installed on user’s system. The most obvious solution is to download and install VDMTools or one to the listed programs: VEDIT. On the top of the page a list that contains all programs grouped based on operating systems supported can be found. The safest method of downloading VDMTools installed is by going to developer’s website () and downloading the software using provided links.

Step 2. Update VDMTools to the latest version

If you already have VDMTools installed on your systems and VDM files are still not opened properly, check if you have the latest version of the software. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. If you have an older version of VDMTools installed, it may not support VDM format. The most recent version of VDMTools is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Set the default application to open VDM files to VDMTools

After installing VDMTools (the most recent version) make sure that it is set as the default application to open VDM files. The method is quite simple and varies little across operating systems.

Change the default application in Windows

• Choose the Open with entry from the file menu accessed by right-mouse clicking on the VDM file
• Click Choose another app and then select More apps option
• To finalize the process, select Look for another app on this PC entry and using the file explorer select the VDMTools installation folder. Confirm by checking Always use this app to open VDM files box and clicking OK button.

Change the default application in Mac OS

• By clicking right mouse button on the selected VDM file open the file menu and choose Information
• Open the Open with section by clicking its name
• From the list choose the appropriate program and confirm by clicking Change for all....
• If you followed the previous steps a message should appear: This change will be applied to all files with VDM extension. Next, click the Continue button to finalize the process.

Step 4. Verify that the VDM is not faulty

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 VDM file. Being unable to access the file can be related to various issues.

1. Check the VDM file for viruses or malware

If the VDM is indeed infected, it is possible that the malware is blocking it from opening. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. VDM file is infected with malware? Follow the steps suggested by your antivirus software.

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

If you obtained the problematic VDM file from a third party, ask them to supply you with another copy. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. It could happen the the download process of file with VDM extension was interrupted and the file data is defective. Download the file again from the same source.

3. Ensure that you have appropriate access rights

Some files require elevated access rights to open them. Log in using an administrative account and see If this solves the problem.

4. Check whether your system can handle VDMTools

If the systems has insufficient resources to open VDM files, try closing all currently running applications and try again.

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

Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with VDM Specification Format file. It is possible that one of the available system or driver updates may solve the problems with VDM files affecting older versions of given software.

Do you want to help?

If you have additional information about the VDM file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on VDM file.