: This indicates the "Regular" weight of the font. It is the standard thickness used for body text in documents and web pages, as opposed to Bold or Italic variants.
If you wish to verify if you have the exact build (6.01 vs 7.01), follow this forensic procedure: arialnormal+opentype+truetype+version+701+western+verified
: If you create a document on a machine with Arial Version 7.00 and open it on a machine with Version 7.01, some professional software (like CorelDRAW or Adobe Creative Cloud ) may flag a "mismatch." : This indicates the "Regular" weight of the font