mozcrt19.dll is a dynamically linked library file. In most of the cases, this file isn't malicious and it can hardly pose harm to your computer. If you have been suffering from the error message, claiming that MOZCRT19.dll is missing, you should download this file to your computer and fix this error. Just google this issue and you will find a source for that. Of course, you should never remove a legitimate version of this file because it may lead you to various PC-related problems.
It might be that mozcrt19.dll is a malicious file that acts as an essential component of a particular parasite. The most of threats depend on such libraries and can't work without them. The mozcrt19.dll file may be responsible for the dangerous payload of such parasites like Virus Doctor. In this case, you should delete this file to reduce all the security and privacy risks. In order to double check it and see whether this file is trustworthy or not, we highly recommend using your regular anti-spyware, such as Reimage, or other removers, like RegCure Pro.