A file with a VDM extension contains the source code of an application created using the Vienna Development Method. VDM-SL is the language that is used to write the source code. If you want to open a VDM file on your computer, you don't need to buy any specialized software. VDM files can be opened using a text editor. Use Notepad, which is the Windows operating system's built-in text editor, to open the VDM file.
Click "Start," then select "All Programs."
Click the "Accessories" folder, then select "Notepad" from the list of applications to launch it.
Click "File" from the menu bar, then select "Open" from the drop-down menu. The Open window opens.
Navigate to the location of the VDM file on your computer, then double-click it. The VDM file opens in the Notepad window.
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