[BUG]: Windows / McStasScript / mcdisplay-webgl-classic does not run/provide visualisation output

[willend]

Describe the bug
When using e.g. the Pylab button on mcgui to generate a McStasScript version of in instrument, the boilerplate notebook does not allow rendering the instrument on Windows. (This may actually be a McStasScript issue)

Document steps to reproduce the bug
Steps to reproduce the behavior:

1. Open an instrument file
2. Click on ‘Pylab'
3. Execute the cells
4. instr.show_instrument() returns The system cannot find the path specified.

Expected behavior
The instrument should be visualised

Screenshots

OS and McStas/McXtrace version (please complete the following information):

• OS: Windows (any)
• McCode variant: McStas or McXtrace alike
• Version: 3.x.y

Idea for patch:
May be as simple as a path correction and/or adding .bat suffix to the command McStasScript side