Bug was reported via this StackOverflow question.

Opening a project file (bpmn, dmn or even swf files) in a different drive (F:/ for example) than the one where VSCode is installed, and then trying to export the SVG will fail.

When resolving the path, NodeJS (or VSCode own FS) will append the new drive path to the VSCode installation path.

A workaround is to add a forward slash before the `fileDirname` variable.