Try forcing Mac default image open command

src/lib/Guiguts/Preferences.pm

@@ -24,12 +24,12 @@ BEGIN {
 # we just keep the tail end (relative) path which will work wherever this release
 # is installed.
 sub setdefaultpath {
-    my ( $oldpath, $defaultpath ) = @_;
+    my ( $oldpath, $defaultpath, $forcedefault ) = @_;
     my $newpath = '';
-    if ( -e $defaultpath )    # If default path exists, consider it for new path
+    if ( -e $defaultpath or $forcedefault )    # If default path exists, consider it for new path
     {
         $newpath = $defaultpath;
-    } else {                  # Otherwise check for no-extension version or elsewhere on path
+    } else {                                   # Otherwise check for no-extension version or elsewhere on path
         my ( $basename, $filepath, $suffix ) =
           fileparse( $defaultpath, ( ".exe", ".com", ".bat" ) );
         my $filename = "$basename$suffix";
@@ -71,6 +71,7 @@ sub setdefaultpath {
             return $newpath;
         }
     } else {
+        print "PATHS\n$oldpath\n$defaultpath\n\n";
         return ( $oldpath ? $oldpath : $defaultpath );    # If all else fails return old path, or if empty, the default path
     }
 }

src/lib/Guiguts/Utilities.pm

@@ -1273,8 +1273,9 @@ sub initialize {
 
     # Override to more likely default locations for Mac
     if ($::OS_MAC) {
-        $::globalviewerpath = ::setdefaultpath( $::globalviewerpath,
-            ::catfile( '/Applications', 'XnViewMP.app', 'Contents', 'MacOS', 'XnViewMP' ) );
+
+        # Force consideration of default Mac Preview command even though it doesn't "exist" as file path
+        $::globalviewerpath = ::setdefaultpath( $::globalviewerpath, 'open -g -a Preview', 1 );
 
         # M1 and Intel-based Macs have some tools installed in different locations
         $trypath = ::catfile( '/opt', 'homebrew', 'bin', 'aspell' );