diff --git a/FyneApp.toml b/FyneApp.toml
index f211201..59684c1 100644
--- a/FyneApp.toml
+++ b/FyneApp.toml
@@ -5,4 +5,4 @@ Icon = "assert/favicon.ico"
 Name = "goodlink-windows-amd64-ui"
 ID = "goodlink.kony.vip"
 Version = "2.5.18"
-Build = 4
+Build = 6
diff --git a/assert/tray_danger.ico b/assert/tray_danger.ico
new file mode 100644
index 0000000..3444854
Binary files /dev/null and b/assert/tray_danger.ico differ
diff --git a/assert/tray_idle.ico b/assert/tray_idle.ico
new file mode 100644
index 0000000..533b1b3
Binary files /dev/null and b/assert/tray_idle.ico differ
diff --git a/assert/tray_success.ico b/assert/tray_success.ico
new file mode 100644
index 0000000..506e5ea
Binary files /dev/null and b/assert/tray_success.ico differ
diff --git a/assert/tray_warning.ico b/assert/tray_warning.ico
new file mode 100644
index 0000000..5da8c99
Binary files /dev/null and b/assert/tray_warning.ico differ
diff --git a/cmd/gen_tray_icons/main.go b/cmd/gen_tray_icons/main.go
index 4a57906..cc0d31c 100644
--- a/cmd/gen_tray_icons/main.go
+++ b/cmd/gen_tray_icons/main.go
@@ -1,5 +1,5 @@
-// gen_tray_icons reads assert/favicon.png and generates 4 tray state PNGs
-// into ui2/ using the same dot-drawing logic as ui2/tray.go.
+// gen_tray_icons reads assert/favicon.png and generates 4 tray state .ico files
+// into assert/ using the same dot-drawing logic as ui2/tray.go.
 // Run from project root: go run ./cmd/gen_tray_icons
 package main
 
@@ -7,10 +7,12 @@ import (
 	"image"
 	"image/color"
 	"image/draw"
-	"image/png"
 	"math"
 	"os"
 	"path/filepath"
+
+	"github.com/antoinefink/golang-ico"
+	"github.com/nfnt/resize"
 )
 
 var (
@@ -25,7 +27,7 @@ func main() {
 	if len(os.Args) > 1 {
 		basePath = os.Args[1]
 	}
-	outDir := "ui2"
+	outDir := "assert"
 	if len(os.Args) > 2 {
 		outDir = os.Args[2]
 	}
@@ -39,15 +41,18 @@ func main() {
 	if err != nil {
 		panic("decode base image: " + err.Error())
 	}
+	// Resize to 32x32 for tray icon (ICO max 256x256; small size suits system tray)
+	const traySize = 32
+	baseImage = resize.Resize(traySize, traySize, baseImage, resize.Lanczos3)
 
 	states := []struct {
 		name string
 		c    color.NRGBA
 	}{
-		{"tray_idle.png", dotColorIdle},
-		{"tray_warning.png", dotColorWarning},
-		{"tray_danger.png", dotColorDanger},
-		{"tray_success.png", dotColorSuccess},
+		{"tray_idle.ico", dotColorIdle},
+		{"tray_warning.ico", dotColorWarning},
+		{"tray_danger.ico", dotColorDanger},
+		{"tray_success.ico", dotColorSuccess},
 	}
 
 	for _, s := range states {
@@ -57,7 +62,7 @@ func main() {
 		if err != nil {
 			panic("create " + outPath + ": " + err.Error())
 		}
-		if err := png.Encode(out, dst); err != nil {
+		if err := ico.Encode(out, dst); err != nil {
 			_ = out.Close()
 			panic("encode " + outPath + ": " + err.Error())
 		}
diff --git a/go.mod b/go.mod
index 1503210..b3b7b46 100644
--- a/go.mod
+++ b/go.mod
@@ -22,6 +22,7 @@ require (
 
 require (
 	fyne.io/systray v1.12.0 // indirect
+	github.com/antoinefink/golang-ico v0.0.0-20251207114801-fa953cf78f26 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fredbi/uri v1.1.1 // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
diff --git a/go.sum b/go.sum
index 30c0c89..e5c69f0 100644
--- a/go.sum
+++ b/go.sum
@@ -8,6 +8,8 @@ github.com/BurntSushi/toml v1.6.0 h1:dRaEfpa2VI55EwlIW72hMRHdWouJeRF7TPYhI+AUQjk
 github.com/BurntSushi/toml v1.6.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/Kodeworks/golang-image-ico v0.0.0-20141118225523-73f0f4cfade9/go.mod h1:7uhhqiBaR4CpN0k9rMjOtjpcfGd6DG2m04zQxKnWQ0I=
 github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
+github.com/antoinefink/golang-ico v0.0.0-20251207114801-fa953cf78f26 h1:aRJlisWHMprWOjJ/ow5ykKz5x8D6uPEU16x35S7rdRc=
+github.com/antoinefink/golang-ico v0.0.0-20251207114801-fa953cf78f26/go.mod h1:kupAIPIZtaUZRWnkktmLPEJoaQSwZpkCqXQz2dorV6Y=
 github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
 github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
diff --git a/main_ui.go b/main_ui.go
index 3019709..3a1592f 100644
--- a/main_ui.go
+++ b/main_ui.go
@@ -3,6 +3,7 @@
 package main
 
 import (
+	"embed"
 	"goodlink/config"
 	"goodlink/pro"
 	_ "goodlink/pro"
@@ -17,6 +18,9 @@ import (
 	"fyne.io/fyne/v2/driver/desktop"
 )
 
+//go:embed assert/tray_idle.ico assert/tray_warning.ico assert/tray_danger.ico assert/tray_success.ico
+var trayIcons embed.FS
+
 const (
 	M_APP_TITLE = "Goodlink"
 )
@@ -52,7 +56,11 @@ func main() {
 		}
 	}()
 
-	ui2.InitTrayIcons()
+	idle, _ := trayIcons.ReadFile("assert/tray_idle.ico")
+	warning, _ := trayIcons.ReadFile("assert/tray_warning.ico")
+	danger, _ := trayIcons.ReadFile("assert/tray_danger.ico")
+	success, _ := trayIcons.ReadFile("assert/tray_success.ico")
+	ui2.InitTrayIcons(idle, warning, danger, success)
 
 	if desk, ok := myApp.(desktop.App); ok {
 		ui2.SetTrayApp(desk)
diff --git a/ui2/tray.go b/ui2/tray.go
index 6f8836e..0c62f75 100644
--- a/ui2/tray.go
+++ b/ui2/tray.go
@@ -3,46 +3,47 @@
 package ui2
 
 import (
-	"embed"
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/driver/desktop"
 	"image/color"
 )
 
-//go:embed tray_idle.png tray_warning.png tray_danger.png tray_success.png
-var trayIconFS embed.FS
-
 var (
 	trayApp         desktop.App
 	currentDotColor color.NRGBA
+	// Pre-generated tray icon data (ICO bytes), set by InitTrayIcons.
+	trayIconIdle    []byte
+	trayIconWarning []byte
+	trayIconDanger  []byte
+	trayIconSuccess []byte
 )
 
-func InitTrayIcons() {
-	// No-op: icons are embedded and selected by UpdateTrayIcon.
+// InitTrayIcons sets the 4 pre-generated tray icon bytes (ICO format).
+// Icons should be from assert/tray_idle.ico, tray_warning.ico, tray_danger.ico, tray_success.ico.
+func InitTrayIcons(idle, warning, danger, success []byte) {
+	trayIconIdle = idle
+	trayIconWarning = warning
+	trayIconDanger = danger
+	trayIconSuccess = success
 }
 
 func iconForDotColor(c color.NRGBA) fyne.Resource {
-	data, _ := trayIconFS.ReadFile(iconNameForDotColor(c))
+	var data []byte
+	if c.R == DotColorIdle.R && c.G == DotColorIdle.G && c.B == DotColorIdle.B {
+		data = trayIconIdle
+	} else if c.R == DotColorWarning.R && c.G == DotColorWarning.G && c.B == DotColorWarning.B {
+		data = trayIconWarning
+	} else if c.R == DotColorDanger.R && c.G == DotColorDanger.G && c.B == DotColorDanger.B {
+		data = trayIconDanger
+	} else if c.R == DotColorSuccess.R && c.G == DotColorSuccess.G && c.B == DotColorSuccess.B {
+		data = trayIconSuccess
+	} else {
+		data = trayIconIdle
+	}
 	if len(data) == 0 {
 		return nil
 	}
-	return fyne.NewStaticResource("tray_icon.png", data)
-}
-
-func iconNameForDotColor(c color.NRGBA) string {
-	if c.R == DotColorIdle.R && c.G == DotColorIdle.G && c.B == DotColorIdle.B {
-		return "tray_idle.png"
-	}
-	if c.R == DotColorWarning.R && c.G == DotColorWarning.G && c.B == DotColorWarning.B {
-		return "tray_warning.png"
-	}
-	if c.R == DotColorDanger.R && c.G == DotColorDanger.G && c.B == DotColorDanger.B {
-		return "tray_danger.png"
-	}
-	if c.R == DotColorSuccess.R && c.G == DotColorSuccess.G && c.B == DotColorSuccess.B {
-		return "tray_success.png"
-	}
-	return "tray_idle.png"
+	return fyne.NewStaticResource("tray_icon.ico", data)
 }
 
 func SetTrayApp(desk desktop.App) {
diff --git a/ui2/tray_danger.png b/ui2/tray_danger.png
deleted file mode 100644
index e966a9f..0000000
Binary files a/ui2/tray_danger.png and /dev/null differ
diff --git a/ui2/tray_idle.png b/ui2/tray_idle.png
deleted file mode 100644
index 9bc0c4c..0000000
Binary files a/ui2/tray_idle.png and /dev/null differ
diff --git a/ui2/tray_success.png b/ui2/tray_success.png
deleted file mode 100644
index dedbbfa..0000000
Binary files a/ui2/tray_success.png and /dev/null differ
diff --git a/ui2/tray_warning.png b/ui2/tray_warning.png
deleted file mode 100644
index 400cafb..0000000
Binary files a/ui2/tray_warning.png and /dev/null differ