Sw Dvd5 Office Professional Plus 2013 W32 English Mlf X18-55138.iso

This indicates the image fits on a standard DVD-5 (4.7 GB). Office 2013 Professional Plus, even with all components, was surprisingly compact (approx. 650–800 MB compressed, ~2.1 GB expanded). The "DVD5" label distinguishes it from DVD9 (8.5 GB dual-layer) or CD media.

This is the most misunderstood term. MLF refers to Microsoft’s internal supply chain designation for shipped to fulfillment centers. It is not a license type itself, but rather an indicator that this ISO was prepared for volume activation methods:

: The edition of Office, which includes Word, Excel, PowerPoint, Outlook, OneNote, Access, Publisher, Lync, and InfoPath. W32 : Specifies the 32-bit (x86) architecture. English : The primary language of the installer.