The phrase "extra quality" in the context of font distribution is subjective and often used as a marketing tag by file sharers rather than a technical certification. It generally implies one of the following:
Many fonts included in these "All-in-One" packs are intellectual property. allkhmerfonts92615 extra quality
AllKhmerFonts92615 Extra Quality is excellent for designers needing legacy application support and extremely crisp print output. For web and modern apps, pair it with Noto Sans Khmer as a fallback. The phrase "extra quality" in the context of
Always test the full Khmer character set (U+1780 to U+17FF, plus U+19E0–19FF) before final delivery. Today, you do not need shady archives
Between 2015 (approx. when "92615" might originate) and today, Khmer typography has leaped forward:
Today, you do not need shady archives. Quality Khmer fonts are standard on every major OS, and free professional-grade fonts exceed anything available in 2015.