Still not available, the Chinese path and file name.
model = Sketchup.active_model
path=model.path
path1=File.expand_path(model.path)
path2=model.path.tr("\\","/")
path.class #-> string
path1.class #-> string
path2.class #-> string
path,path1 and path2, all class are string, all value are "/Users/liuzhenyi/Desktop/中文/测试.skp"
so,path=path1=path2.
{File.expand_path(model.path)} same as the original {model.path.tr("\","/") or model.path}
File.delete(), File.exist?() and File.rename() , I tested ,not supported chinese.
I use google search, found it difficult to support.
Thanks TIG. hope you have a good solution.