diff --git a/sys/lib/plumb/basic b/sys/lib/plumb/basic
index 9f2aacba9..6f2462796 100644
--- a/sys/lib/plumb/basic
+++ b/sys/lib/plumb/basic
@@ -45,7 +45,7 @@ plumb client page -wi
 # the port is here for reference but is unused
 type is text
 data matches '[a-zA-Z¡-￿0-9_\-./]+'
-data matches '([a-zA-Z¡-￿0-9_\-./]+)\.(ps|PS|eps|EPS|pdf|PDF|dvi|DVI|doc|DOC|x?html?|X?HTML?|epub|EPUB|cb[tz]|CB[TZ])'
+data matches '([a-zA-Z¡-￿0-9_\-./]+)\.(ps|PS|eps|EPS|pdf|PDF|dvi|DVI|doc|DOC|epub|EPUB|cb[tz]|CB[TZ])'
 arg isfile	$0
 plumb to postscript
 plumb start page -w $file