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You found an .eot file in a web project's font directory. It's a relic. EOT (Embedded OpenType) was Microsoft's proprietary web font format, created for Internet Explorer when no other browser supported custom fonts. It served its purpose from IE4 through IE11, and now it serves no purpose at all.
EOT wrapped TrueType font data with DRM-like restrictions — the font was tied to specific domains, preventing casual redistribution. This was Microsoft's condition for allowing custom fonts on the web before the @font-face standard was widely supported. By the time WOFF and WOFF2 arrived (supported by all browsers), EOT was already an anachronism.
Only Internet Explorer opens EOT files. No modern browser supports it. If you have EOT files in a web project, they can be safely removed unless you're supporting IE8 or earlier (you're not). Replace with WOFF2 for modern browsers. FontForge (free) can convert EOT to other formats if you somehow need to recover the font data.