Show folder button is broken in Windows 10

[fuhrmanator]

Describe the bug
Clicking on the Show folder button for an image fails in PL 3.0 - this is a very useful feature in Windows but it now throws a Instance of Win64Platform did not understand #privShellExplore: error.

To Reproduce
Steps to reproduce the behavior:

1. Running PL in Windows 10, Select an image
2. Click on the Show (folder) button (icon):
   
3. See error

Expected behavior
Show the folder of the image in the OS (this feature worked fine in PL 2.x, it's a regression)

Screenshots

Version information:

• OS: Windows 10
• Version: Pharo Launcher 3.0

Expected development cost
Unknown, but regressions with different OS could be tested in CI. Windows is a popular platform with end users, even if the devs prefer Linux and MacOS.

[demarey]

@fuhrmanator this kind of feature is very hard to test => interaction with the operating system.
The only thing that could be tested is that there is no error on instance side. It is done in a command test but tests are, for now, only ran on linux. Only a few tests are impacted by the OS and I'm not sure it worths to run tests on all OS/arch combinations.