So, from my understanding, the following is the case: starting ~windows 7 
Microsoft started to deprecate DDE (Dynamic Data Exchange) which was a way 
to transport data between applications. There is/was a 'hack' one could 
apply to shortcuts and append something like `/dde %1` to the executable 
path in order to have it open new files in the same instance. However, this 
does not seem to work in any recent windows. Trying to Google for this will 
result in 99% Microsoft Excel results which, ironically, has a built-in 
option in the program which allows to toggle this behavior.

Sadly, Microsoft MVP in forums - in response to people complaining - points 
to program authors and denies any responsibility nor does it acknowledge 
that this behavior used to be different in earlier Windows (it was, you are 
not going mad and aren't mistaken).

>From what I've found, there currently doesn't seem to be a solution out 
there but if there is one, it should be found in the registry likely. 
Explorer itself only allows this option for it's own fs objects and only 
for folders to open/not-open in new windows.

The only workable solution AFAIK is to *drag* the files from explorer onto 
Electron/LightTable, which will open up a new tab.
 

On Thursday, July 7, 2016 at 12:44:23 PM UTC+2, Avi Vaknin wrote:
>
> how to disable new instances of Light Table when opening a new file from 
> windows explorer?
>

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