Switch to side-by-side view

--- a/src/sampleconf/mimeview.mac
+++ b/src/sampleconf/mimeview.mac
@@ -107,6 +107,7 @@
 application/x-rar = ark %f
 application/x-tar = ark %f
 application/zip = ark %f
+application/x-7z-compressed = ark %f
 
 application/x-awk = emacsclient  %f
 application/x-perl = emacsclient  %f