handle modern favicons, app path exclusion, seo files, ignore images scripts and fonts, redirect all to page handler and if file not found send different query string to page handler.

.htaccess

RewriteEngine On

# handle modern favicons
RewriteRule ^(browserconfig.xml|manifest.json|safari-pinned-tab.svg|(android-chrome|favicon|mstile)-[0-9]+x[0-9]+.png|apple-touch-icon(-precompressed.png|-[0-9]+x[0-9]+.png|.png)|manifest.json)$ /favicon/$1 [L]

# exclude editor path
RewriteRule ^app\/ - [L]

# handle all seo files
RewriteRule ^(epndomain.txt|LiveSearchSiteAuth.xml|google[A-Za-z0-9]+.xml|[A-Za-z0-9]+.txt|(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|([a-zA-Z0-9][a-zA-Z0-9-_]{1,61}[a-zA-Z0-9]))\.([a-zA-Z]{2,6}|[a-zA-Z0-9-]{2,30}\.[a-zA-Z]{2,3})[A-Za-z0-9]+.html|robots.txt|sitemap.xml)$ display.php?seo=$1 [NC,L]

# ignore physical images, scripts, and fonts
RewriteCond %{REQUEST_URI} !\.(jpg|png|bmp|gif|css|js|map|ttf|woff|woff2|svg|eot)$

# display page contents
RewriteRule ^(.*)$ display.php?page=$1 [NC,L,QSA]

# handle missing physical images, scripts and fonts
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ display.php?page=error&rewritten=1&missing=$1 [NC,L,QSA]