Ok, so you've clarified that, in most cases at least, your intent with "open file location" is to go to the folder which the open file is in so that you can open one or more other files within the same folder (or another folder close by).
Assuming you use Windows (I don't know how it works on Mac), once the Explorer window opens, you can open any files you want right from there just by double-clicking them (or select multiple, right-click, and select open).
From within the Inventor Open dialogue, once it's pointing to the right folder, it's a very similar amount of effort to open the files as from Explorer.
Considering all the other things you can do with files from the Explorer window, that are harder or even impossible from the Open Dialogue, why might someone then prefer the latter over the former?
Thinking it over myself, one thing could be that all non-Inventor files have been filtered out in the Open Dialogue, so it could be much easier to find the files you want if there are many other non-Inventor files in the folder.
If that's the case, you could potentially create a work-around by using an external iLogic rule to run the File Open window using the active file path as the base point.