Many users will have a few files they access so often they serve a direct link in the MacOS dock. To quickly differentiate between different Word files with the same standard icon, the best way is to use a custom icon (bottom right). This is easily done by copying and pasting a new icon in the Get Info window. The problem is, these icons constantly get deleted by Word (bottom left) when you change the file, making a stable non-default icon impossible (Mac Word 2011 & 2016 on MacOS 10.11).
Do you have a way to create a dock link to a Word file with a custom icon and have it survive the next round of editing?