If you cannot open the DND file on your computer - there may be several reasons. The first and most important reason (the most common) is the lack of a suitable application that supports DND among those that are installed on your computer.
A very simple way to solve this problem is to find and download the appropriate application. The first part of the task has already been done – the software supporting the DND file can be found below. Now just download and install the appropriate application.
This site also defines other possible causes causing the problems with DND files
POSSIBLE PROBLEMS WITH THE FILES THAT ARE IN THE DND FORMAT
The inability to open and operate the DND file does not necessarily mean that you do not have an appropriate software installed on your computer. There may be other problems that also block our ability to operate the ClustalW2 Tree file. Below is a list of possible problems.
Corruption of a DND file which is being opened
Incorrect links to the DND file in registry entries.
Accidental deletion of the description of the DND from the Windows registry
Incomplete installation of an application that supports the DND format
The DND file which is being opened is infected with an undesirable malware.
The computer does not have enough hardware resources to cope with the opening of the DND file.
Drivers of equipment used by the computer to open a DND file are out of date.
If you are sure that all of these reasons do not exist in your case (or have already been eliminated), the DND file should operate with your programs without any problem. If the problem with the DND file has not been solved, it may be due to the fact that in this case there is also another rare problem with the DND file. In this case, the only you can do is to ask for assistance of a professional staff.
The dnd file extension is associated with the ClustalW2 that is a general purpose multiple sequence alignment program for DNA or proteins for Windows, Mac and Linux.
The dnd file contains various data used for internal purposes of ClustalW2.