If you apply the attached patch and import the attached registry file (which registers a junction point for the unixfs shell namespace extension), you can select and open files from the unix filesystem in notepad (The file has to be accessible by a drive letter based wine path though).
In retrospect this is not as surprising as I first thought. If I pay for some beer, perhaps at wineconf someone can give me some insight on the unix path <-> wine path conversion magic ;)
Bye,