Before submitting a bug I like to ask if this is a known limitation.
I can open files interactively on Windows 10 using the Bio-formats plugin (I have installed Version 5-sept-2018).
It also doesn't seem to matter if I read from local drive, network shares or use UNC notation. Also filenames containing spaces open without issues. When using the ImageJ macro extensions, however, the opening of filenames containing spaces fail. I get a dialog box from the Bio-formats importer displaying: Sorry there was an I/O problem during import.
Is that expected behaviour?
Here's a code snipppet I use:
run("Bio-Formats Macro Extensions");
run("Bio-Formats","open=" + filename + " autoscale color_mode=Default rois_import=[ROI manager] view=Hyperstack stack_order=XYCZT" );