“Arial Normal” is rarely the filename; on Windows, the regular style is usually Arial.ttf . “Normal” is an internal fontSubfamily name.
OpenType and TrueType refer to the digital file formats. Being "OpenType" means it supports advanced typographic features and a massive character set (Unicode), making it cross-platform compatible between Mac and PC. arialnormal opentype truetype version 701 western top
The "Western" subset of Version 701 was pre-installed on millions of machines running Windows Vista Home Basic and Windows 7 Starter Edition (lower-cost editions that omitted multi-language support to save space). “Arial Normal” is rarely the filename; on Windows,
In ATM (Adobe Type Manager), a “Top” suffix sometimes indicated the first or primary cut of a font in a family. If you send a
If you send a .docx or .pdf that specifies "Arialnormal Opentype Truetype Version 701 Western Top" and the recipient has Arial Version 8.0 (which includes Cyrillic and has different metrics), Lines could break differently, page numbers shift, and layouts break. Knowing the exact version allows you to embed or subset the exact font.