diff --git a/src/shared/shared.ts b/src/shared/shared.ts
index a67ae325..bbc3e94e 100644
--- a/src/shared/shared.ts
+++ b/src/shared/shared.ts
@@ -185,15 +185,15 @@ export function slash(p: string): string {
 // md, html? are intentionally omitted, see treatAsHtml
 const KNOWN_EXTENSIONS = new Set(
   (
-    '3g2,3gp,7z,aac,abw,ai,aif,aifc,aiff,arc,asf,asr,asx,au,avi,avif,axs,' +
-    'azw,bin,bmp,bz,bz2,c,cda,cer,class,crl,crt,csh,css,csv,dcr,der,dll,doc,' +
-    'docx,eot,eps,epub,exe,gif,gtar,gz,gzip,ico,ics,ief,jar,jpe,jpeg,jpg,js,' +
-    'json,jsonld,latex,m3u,man,mdb,mht,mhtml,mid,midi,mjs,mov,mp2,mp3,mp4,' +
-    'mpa,mpe,mpeg,mpg,mpkg,mpp,odp,ods,odt,oga,ogv,ogx,opus,otf,p10,p12,p7b,' +
-    'p7c,p7m,p7r,p7s,pbm,pdf,pfx,php,png,ppt,pptx,ps,pub,qt,rar,roff,rtf,' +
-    'rtx,ser,sh,spc,svg,swf,t,tar,tcl,tex,texi,texinfo,tgz,tif,tiff,tr,ts,' +
-    'tsv,ttf,txt,ua,viv,vivo,vsd,wav,weba,webm,webp,woff,woff2,xbm,xhtml,' +
-    'xls,xlsx,xml,xul,zip,conf'
+    '3g2,3gp,7z,aac,abw,ai,aif,aifc,aiff,apng,arc,asf,asr,asx,au,avi,avif,axs,' +
+    'azw,bin,bmp,bz,bz2,c,cda,cer,class,crl,crt,csh,css,csv,dcr,der,dll,doc,docx,' +
+    'eot,eps,epub,exe,flac,gif,gtar,gz,gzip,ico,ics,ief,jar,jfif,jpe,jpeg,jpg,' +
+    'js,json,jsonld,latex,m3u,m4a,man,mdb,mht,mhtml,mid,midi,mjs,mov,mp2,mp3,mp4,' +
+    'mpa,mpe,mpeg,mpg,mpkg,mpp,odp,ods,odt,oga,ogg,ogv,ogx,opus,otf,p10,p12,p7b,' +
+    'p7c,p7m,p7r,p7s,pbm,pdf,pfx,php,pjp,pjpeg,png,ppt,pptx,ps,pub,qt,rar,roff,' +
+    'rtf,rtx,ser,sh,spc,svg,swf,t,tar,tcl,tex,texi,texinfo,tgz,tif,tiff,tr,ts,' +
+    'tsv,ttf,txt,ua,viv,vivo,vsd,vtt,wav,weba,webm,webp,woff,woff2,xbm,xhtml,' +
+    'xls,xlsx,xml,xul,yaml,yml,zip,conf'
   ).split(',')
 )