Index: openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl,v
diff -u -r1.15.2.9 -r1.15.2.10
--- openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl	14 Feb 2020 13:42:12 -0000	1.15.2.9
+++ openacs-4/packages/xowiki/tcl/upgrade/upgrade.tcl	13 Jul 2020 12:02:34 -0000	1.15.2.10
@@ -450,7 +450,7 @@
         www/prototypes/announcements.page 
         www/admin/regression_test.tcl
       } {
-        if {[file exists $dir/$file]} {
+        if {[ad_file exists $dir/$file]} {
           ns_log notice "Deleting obsolete file $dir/$file"
           file delete -- $dir/$file
         }