From what I see in 8.0.3.7 it seems we'd need a bit more tweaking here. 
(1) The calculation seems to be wrong if it's supposed to be M(i)B like Windows Explorer uses it. Example
File size (Bytes): 94517872
File size (MiB): 90.1
File size (XMM8 Grid): 94.517872
It's most likely not necessary to have more than one number after the decimal point.
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Of course it would be nice to have variants in the grid like:
90.1 MiB (file 1)
4.4 GiB (file 2)
...
depending on the actual file size. But I guess this would require some additional logic for sorting by size.
