Upon using the /run command:

/run J:\folder

Explorer.exe crashed with a dialog box left "titled" and saying:

"/idlist,:636:2700,J:\folder"
Windows cannot find '/idlist:636:2700,J:\folder'. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

I'm sure i have had this happen before in previous versions also.
It seems to be a random occurrence, and am unsure how to reproduce it, i thought the '/idlist' might make sense to Khaled.
Altho a quick Google search on "/idlist" it comes up with 1.5 million results. But nothing specifically on the message i recieved.

(i have a screenshot but had no-where to upload it, hopefully the text is all thats necessary)