"Extra quality" often refers to superior font hinting. Hinting is the use of mathematical instructions to adjust the display of an outline font so that it lines up with a rasterized grid (like your computer screen). This makes the text look sharper at small sizes.
While users often search for "extra quality" or "patched" versions, the most reliable and legal way to obtain or repair Arial is through official channels: Arial font (regular) disappeared - Microsoft Q&A 1 May 2020 — "Extra quality" often refers to superior font hinting
If you need help generating a (e.g., how to detect font file tampering, PANOSE-1 analysis of your system fonts, or how to substitute Arial legally in a corporate environment), let me know and I’ll provide that instead. While users often search for "extra quality" or
For Arial Normal (Regular), the signature is approximately: 2 11 6 4 2 2 2 2 2 4 . how to detect font file tampering