c1dd7be8_Notes_Search_Modifiers_Filters__Description
[Windows Property] System.FileName [Example(s)] filename:myattach.txt [Note Source Item] Only set on Attachments to the original filename. Extracted from the Rich Text Field which references it. If not found in a Rich Text field, the $File value is used. [Description] 
The original filename of the attachment.
NotesConnectors.com: EZ Notes Search Modifiers/Filters
Description