Do you use branding in the filename?
It is important that the documents you provide are branded appropriately. This is not just the document's formatting, but the Title of the document and the File Name as well.
At SSW our proposals Title and File Name are always prefixed with SSW. This allows for clients to easily recognise a proposal provided by us before even opening the document, it also immedietly identifies our documents to anyone else who may read them in the future.