. While the software will still function if installed, it no longer receives security updates, leaving it vulnerable to potential threats. Microsoft Support
: This seems to be an identifier or a specific build number for the ISO image. it no longer receives security updates
SW_DVD5_Office_Professional_Plus_2013_W32_English_MLF_X18-55138.ISO Original Build: 15.0.4420.1017 (Initial VL Release) it no longer receives security updates
The specific file you are referring to () is the standard 32-bit release for volume license customers. Microsoft Office 2013 Professional Plus (Volume License) Asset Information: Full Name: Microsoft Office Professional Plus 2013 (32-bit) it no longer receives security updates
: This could stand for "Multiple Language File" or more accurately in Microsoft's context, it might refer to the type of installation or media, but commonly, it denotes that the ISO contains multiple languages.