^+o:: ;link text files in D:\Texts
WinGetTitle, Title, A
StringReplace, Title, Title, - Notepad, , All
thefilename := clipboard
FileAppend, %thefilename%, %thefilename%
Just select the entire file name, like "start.txt" or "start.rtf", and press ^+o.
You can, of course change the hotkey as well as the directory. It should also work with other file types, as long as they are registered in Windows. The script is not a wiki, of course, but its linking behavior comes close. If you use a rtf files, you have other markup as well. In fact, it is a very rudimentary wysiwyg wiki.