Ive checked the manual but there does not seem to be any explanation to what the metadata acronyms in WaveLab13 Elements / Montage stand for the following:
IARC - Archive location?
ITRK / TRCK - Track Number? there are 11 on my album
Not sure how it is in Elements but in WL13 Pro if you hover over each acronym a pop-up info line appears, which should help understand what it might be used for. Or for the long answer you could take a look at this: https://www.mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/riffmci.pdf although it’s out of date.
FWIW depending on what your purpose is, some of the RIFF metadata might be more useful than others. For example, in the Windows environment the following metadata embedded in the file would be recognised in Windows Explorer or when you select Properties>Details for the file:
IPRD - Album
INAM - Title
ICOP - Copyright
IGNR - Genre
IART - Contributing Artists
ICMT - Comments
But ID3v2 tags are usually better especially when used for purposes like iTunes-compatible tagging, for example.