I am also experiencing the same problem. However i seem to have this issue in one machine, but not in another even though the both have the same VS Code version.

I think this is intentional behavior since Code doesn't launch two instances for the same folder. Related discussion #48

@Tyriar that isn't the behavior I'm seeing. You say for the same folder. The second instance launch attempt could/would be for a totally different folder. That's the problem. Folder1 is open in VSCode instance1, trying to open Folder2 for a 2nd VSCode instance from Windows Explorer fails.

@tstringer Windows 10?

@bpasero That's correct, Windows 10.

very likely #929

@bpasero I don't believe this is #929.

I'm on Windows 10 and have Code open for a folder (M:\Coding\Applications\Dart-Code) and I'm double-clicking on a Markdown file M:\Apps\Dart\lib\analysis_server\README.md and nothing is happening. If I manually switch to the Code window I have open, the README has most certainly not opened.

(It's not isolated to this time, I've never been able to open a second instance, not even by clicking the "New Window" task under VS Code from the Taskbar, or middle-clicking on it!)

Ok, figured this out - it happens when the instance of Code already open is elevated - I launched it from an Admin PoSh window. If I open it as non-Admin then I don't see this behaviour.

It definitely doesn't make sense to behave like this; let me know if I should open a new issue or you'll just reuse this one.