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In LC image data refers to the pixel data of the image where each pixel is represented by 4 bytes, in the case of the polylist it means the actual data of the image file, equivalent to text property of image controls.
In the case of image-path it refers to a path to a image file, which I recommend ...

The first form should work, make sure your polylist has a sub item with image-data type named "wind"
You can provide a sample stack with the issue if you need further help or PM at me

Image-data type actually accepts the text property content of images

Hello @bbalmerTotalFluency
for this to work you'll need to set the contentType of the column to text-multiline, and maybe increase the rowHeight of the widget to allow several lines to fit vertically

(I'm assuming you are on mac)

Ignore extra "\" on the strings with "."

The expected result for your handler would be:
"Library version 1\.14\.58-7 on OS : mac"

(Taken from the Dictionary)
Returns a string describing the operating system that LiveCode is running on. The possible values are ...