iSO files are extracted by 7z.
when MultiArc makes a file list, the list are contain 0 byte file & folder.
in reality, 0 byte file is not exists. only folder is exist.
there are not discriminated 0 byte files from folders.
multiarc.ISO.log & multiarc.ISO-UDF.log files are debug information files.
multiarcbug.png file is a part of screen shot by error.
debug file for iso/udf-iso file listing.