This is a new thing - it first happened to me a few days ago, but today it is happening again, but with a different file.
Slickedit is running.
From a separate CMD window, I type "vs"
Normally this just brings Slickedit to front.
Now, it also opens a specific file (C:\src\file.bat).
From the cmd prompt, if I do
vs OtherFile.txt
Slick behaves as expected, but then
vs
slick again opens (or makes active) C:\src\file.bat
Earlier I did have a 2nd instance of Slickedit open (via vs +new), but currently I have only the original instance open.