In your Windows operating system, you may get some DLL files that are very important for the proper running of various applications. Msdmo.dll file is one of them. When the msdmo.dll file gets corrupt or removed or deleted then you will see the msdmo.dll is missing error in Windows. It is really a very irritating issue. Actually the msdmo.dll file is attached or associated with many applications or programs that get inaccessible due to the corruption of the file. If the issue is not resolved very soon, then it may harm the computer data very badly. So, it is very important to fix this issue with the help of the manual or automatic tricks. If you want to fix the issue automatically then you can download Advanced System Repair tool in your computer.