MozMapi32.dll file is associated with PHP 5 that is developed for Windows operating system. If you have installed Mozilla Firefox in your computer then you may confront with MozMapi32.dll is missing error in Windows while accessing it. Actually when you try to open the Mozilla Firefox in your computer and the MozMapi32.dll file gets corrupt suddenly, then you may get this error issue in your computer. After the occurring of this error, you will not be able to run the Mozilla or access it easily. The problem will make you very much annoyed. In this case, you should go through some manual or automatic way of troubleshooting to fix the issue. You can use Advanced System Repair tool in your computer to get rid of the problem automatically.