diff --git a/cmd/zenity/main.go b/cmd/zenity/main.go
index 7ce1557..e5b0713 100644
--- a/cmd/zenity/main.go
+++ b/cmd/zenity/main.go
@@ -240,7 +240,7 @@ func (f *FileFilters) String() string {
 func (f *FileFilters) Set(s string) error {
 	var filter zenity.FileFilter
 
-	if split := strings.SplitN(s, "|", 2); len(split) > 0 {
+	if split := strings.SplitN(s, "|", 2); len(split) > 1 {
 		filter.Name = split[0]
 		s = split[1]
 	}
diff --git a/file_darwin.go b/file_darwin.go
index c4850af..f7ba02a 100644
--- a/file_darwin.go
+++ b/file_darwin.go
@@ -4,6 +4,7 @@ import (
 	"os/exec"
 	"strings"
 
+	"github.com/ncruces/zenity/internal/cmd"
 	"github.com/ncruces/zenity/internal/osa"
 )
 
@@ -34,6 +35,7 @@ func SelectFileMutiple(options ...Option) ([]string, error) {
 		Multiple:  true,
 		Prompt:    opts.title,
 		Location:  opts.filename,
+		Separator: cmd.Separator,
 		Type:      appleFilters(opts.filters),
 	})
 	if err, ok := err.(*exec.ExitError); ok && err.ExitCode() == 1 {
@@ -48,7 +50,7 @@ func SelectFileMutiple(options ...Option) ([]string, error) {
 	if len(out) == 0 {
 		return nil, nil
 	}
-	return strings.Split(string(out), "\x00"), nil
+	return strings.Split(string(out), cmd.Separator), nil
 }
 
 func SelectFileSave(options ...Option) (string, error) {
@@ -93,7 +95,16 @@ func appleFilters(filters []FileFilter) []string {
 	var filter []string
 	for _, f := range filters {
 		for _, p := range f.Patterns {
-			filter = append(filter, p) // FIXME
+			star := strings.LastIndexByte(p, '*')
+			if star >= 0 {
+				dot := strings.LastIndexByte(p, '.')
+				if star > dot {
+					return nil
+				}
+				filter = append(filter, p[dot+1:])
+			} else {
+				filter = append(filter, p)
+			}
 		}
 	}
 	return filter
diff --git a/internal/cmd/cmd.go b/internal/cmd/cmd.go
index f4809e9..4e9c44e 100644
--- a/internal/cmd/cmd.go
+++ b/internal/cmd/cmd.go
@@ -1,4 +1,4 @@
 package cmd
 
 var Command bool
-var Separator string
+var Separator = "\x00"
diff --git a/internal/osa/osa_darwin.go b/internal/osa/osa_darwin.go
index 4ec8240..54a9c82 100644
--- a/internal/osa/osa_darwin.go
+++ b/internal/osa/osa_darwin.go
@@ -38,9 +38,9 @@ type File struct {
 	Prompt    string
 	Name      string
 	Location  string
+	Separator string
 	Type      []string
 	Multiple  bool
-	Separator rune
 }
 
 type Msg struct {
diff --git a/internal/osa/scripts/file.gots b/internal/osa/scripts/file.gots
index 475067a..b0430fe 100644
--- a/internal/osa/scripts/file.gots
+++ b/internal/osa/scripts/file.gots
@@ -18,7 +18,7 @@ opts.multipleSelectionsAllowed = {{.Multiple}}
 
 var res = app[{{.Operation}}](opts)
 if (Array.isArray(res)) {
-	res.join(String.fromCodePoint({{.Separator}}))
+	res.join({{.Separator}})
 } else {
 	res.toString()
 }
\ No newline at end of file