orcus-xlsx, orcus-ods etc generates uneven flat output with UTF-8 contents.
Run
orcus-xlsx -o outdir -f flat some-file.xlsx
which outputs the content of the file in multiple separate text files in the outdir. When cell values are unicode, it miscalculates their widths and the grid borders become mis-aligned. We probably need to correctly calculate the width of utf-8 string to fix this.