User Shell script on Windows

Hi
I want to know so I can stop trying: is shell script still working for Windows and Digikam 8.6.0? I used to be able to pass images from Digikam to darktable, but I cannot get it to work anymore

The variable %INPUT% is not set, no matter what I tried. There is very few examples available for Windows, but most is as simple as
echo INPUT FILE: %INPUT%

I tried all the suggestions I could find on PIXLS.US, until I ended up with the most convoluted one I could think of:

User Shell script:
C:\Temp\Blah.bat "%TITLE%"

Batchfile (C:\Temp\Blah.bat):
echo Write this: %1 >C:\Temp\Out.txt

Output (C:\Temp\Out.txt)
Write this: “The title of my image”

But when I try %INPUT% in any of the possible ways e.g
C:\Temp\Blah.bat “%INPUT%

The output is
Write this: “”

What am I missing, or is it simply not working on Windows anymore?

PS: Edited to escape the percentage signs