diff --git a/.gitattributes b/.gitattributes
index 4754b74..c63c54e 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1 +1 @@
-utils/resourcepack-ace.go filter=git-crypt diff=git-crypt
\ No newline at end of file
+subcommands/resourcepack-d/resourcepack-d.go filter=git-crypt diff=git-crypt
\ No newline at end of file
diff --git a/build.py b/build.py
index a09229d..fc70b05 100644
--- a/build.py
+++ b/build.py
@@ -12,8 +12,8 @@ VER = VER_RE.match(TAG).group(1)
 CI = not not os.getenv("GITLAB_CI")
 
 
-with open("./utils/resourcepack-ace.go", "rb") as f:
-    PACK_SUPPORT = f.read(7) == b"package"
+with open("./subcommands/resourcepack-d/resourcepack-d.go", "rb") as f:
+    PACK_SUPPORT = f.read(100).count(b"package ") > 0
 
 print(f"Pack Support: {PACK_SUPPORT}")
 
@@ -21,7 +21,7 @@ LDFLAGS = f"-s -w -X github.com/bedrock-tool/bedrocktool/utils.Version={TAG}"
 
 PLATFORMS = [
     ("windows", ["386", "amd64"], ".exe"),
-    ("linux", ["386", "amd64", "arm", "arm64"], ""),
+    ("linux", ["386", "amd64", "arm64"], ""),
     #("darwin", ["amd64", "arm64"], ""),
     ("android", ["arm64"], ".apk")
 ]
@@ -60,21 +60,19 @@ for (platform_name, archs, ext) in PLATFORMS:
         SUB1 = '-gui' if GUI else ''
         name = f"{NAME}{SUB1}"
 
+        tags = []
         env = ["GOVCS=*:off"]
-        GOFLAGS = []
         if not PACK_SUPPORT:
-            GOFLAGS.append("-overlay=overlay.json")
+            tags.append("nopacks")
 
         if GUI:
-            if len(GOFLAGS):
-                env.append(f"GOFLAGS={' '.join(GOFLAGS)}")
             args = [
                 "fyne-cross", platform_name,
                 "-app-version", VER,
                 "-arch", ",".join(archs),
                 "-ldflags", LDFLAGS + f" -X github.com/bedrock-tool/bedrocktool/utils.CmdName=bedrocktool-gui",
                 "-name", name,
-                "-tags", "gui",
+                "-tags", ",".join(["gui"] + tags),
                 "-debug"
             ]
             for e in env:
@@ -96,10 +94,10 @@ for (platform_name, archs, ext) in PLATFORMS:
                     "go", "build",
                     "-ldflags", LDFLAGS,
                     "-trimpath",
+                    "-tags", ",".join(tags),
                     "-v",
                     "-o", out_path,
                 ]
-                args.extend(GOFLAGS)
                 args.append("./cmd/bedrocktool")
                 print(args)
                 out = subprocess.run(args)
diff --git a/cmd/bedrocktool/main.go b/cmd/bedrocktool/main.go
index e064495..760b3d8 100644
--- a/cmd/bedrocktool/main.go
+++ b/cmd/bedrocktool/main.go
@@ -232,14 +232,6 @@ func (c *CreateCustomDataCMD) Execute(_ context.Context, f *flag.FlagSet, _ ...i
 	return 0
 }
 
-func (c *TransCMD) MainWindow() error {
-	return nil
-}
-
-func (c *CreateCustomDataCMD) MainWindow() error {
-	return nil
-}
-
 func init() {
 	utils.RegisterCommand(&TransCMD{})
 	utils.RegisterCommand(&CreateCustomDataCMD{})
diff --git a/overlay.json b/overlay.json
deleted file mode 100644
index c139207..0000000
--- a/overlay.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "Replace": {
-        "utils/resourcepack-ace.go": "utils/dummy"
-    }
-}
\ No newline at end of file
diff --git a/subcommands/chat_log.go b/subcommands/chat_log.go
index 65a8e4f..1a284e6 100644
--- a/subcommands/chat_log.go
+++ b/subcommands/chat_log.go
@@ -7,8 +7,6 @@ import (
 	"os"
 	"time"
 
-	"fyne.io/fyne/v2/data/binding"
-	"fyne.io/fyne/v2/widget"
 	"github.com/bedrock-tool/bedrocktool/locale"
 	"github.com/bedrock-tool/bedrocktool/utils"
 
@@ -30,19 +28,6 @@ func (c *ChatLogCMD) SetFlags(f *flag.FlagSet) {
 	f.BoolVar(&c.Verbose, "v", false, "verbose")
 }
 
-func (c *ChatLogCMD) SettingsUI() *widget.Form {
-	return widget.NewForm(
-		widget.NewFormItem(
-			"serverAddress", widget.NewEntryWithData(binding.BindString(&c.ServerAddress)),
-		), widget.NewFormItem(
-			"", widget.NewCheckWithData("verbose", binding.BindBool(&c.Verbose)),
-		),
-	)
-}
-func (c *ChatLogCMD) MainWindow() error {
-	return nil
-}
-
 func (c *ChatLogCMD) Usage() string {
 	return c.Name() + ": " + c.Synopsis() + "\n" + locale.Loc("server_address_help", nil)
 }
diff --git a/subcommands/resourcepack-d.go b/subcommands/resourcepack-d.go
new file mode 100644
index 0000000..8b3f00d
--- /dev/null
+++ b/subcommands/resourcepack-d.go
@@ -0,0 +1,49 @@
+//go:build !nopacks
+
+package subcommands
+
+import (
+	"context"
+	"flag"
+
+	"github.com/bedrock-tool/bedrocktool/locale"
+	resourcepackd "github.com/bedrock-tool/bedrocktool/subcommands/resourcepack-d"
+	"github.com/bedrock-tool/bedrocktool/utils"
+	"github.com/google/subcommands"
+	"github.com/sirupsen/logrus"
+)
+
+// decrypt using cfb with segmentsize = 1
+
+type ResourcePackCMD struct {
+	ServerAddress string
+	SaveEncrypted bool
+	OnlyKeys      bool
+}
+
+func (*ResourcePackCMD) Name() string     { return "packs" }
+func (*ResourcePackCMD) Synopsis() string { return locale.Loc("pack_synopsis", nil) }
+
+func (c *ResourcePackCMD) SetFlags(f *flag.FlagSet) {
+	f.StringVar(&c.ServerAddress, "address", "", locale.Loc("remote_address", nil))
+	f.BoolVar(&c.SaveEncrypted, "save-encrypted", false, locale.Loc("save_encrypted", nil))
+	f.BoolVar(&c.OnlyKeys, "only-keys", false, locale.Loc("only_keys", nil))
+}
+
+func (c *ResourcePackCMD) Usage() string {
+	return c.Name() + ": " + c.Synopsis() + "\n" + locale.Loc("server_address_help", nil)
+}
+
+func (c *ResourcePackCMD) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
+	err := resourcepackd.Execute_cmd(ctx, c.ServerAddress, c.OnlyKeys, c.SaveEncrypted)
+	if err != nil {
+		logrus.Error(err)
+		return 1
+	}
+	return 0
+}
+
+func init() {
+	utils.RegisterCommand(&ResourcePackCMD{})
+
+}
diff --git a/subcommands/resourcepack-d/resourcepack-d.go b/subcommands/resourcepack-d/resourcepack-d.go
new file mode 100644
index 0000000..674462c
Binary files /dev/null and b/subcommands/resourcepack-d/resourcepack-d.go differ
diff --git a/subcommands/resourcepack-stub.go b/subcommands/resourcepack-stub.go
new file mode 100644
index 0000000..893b6a8
--- /dev/null
+++ b/subcommands/resourcepack-stub.go
@@ -0,0 +1,36 @@
+//go:build nopacks
+
+package subcommands
+
+import (
+	"context"
+	"flag"
+
+	"github.com/bedrock-tool/bedrocktool/utils"
+	"github.com/google/subcommands"
+	"github.com/sirupsen/logrus"
+)
+
+type ResourcePackCMD struct {
+	ServerAddress string
+	SaveEncrypted bool
+	OnlyKeys      bool
+}
+
+func (*ResourcePackCMD) Name() string     { return "packs" }
+func (*ResourcePackCMD) Synopsis() string { return "NOT COMPILED" }
+
+func (c *ResourcePackCMD) SetFlags(f *flag.FlagSet) {}
+
+func (c *ResourcePackCMD) Usage() string {
+	return c.Name() + ": " + c.Synopsis()
+}
+
+func (c *ResourcePackCMD) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
+	logrus.Error("not compiled")
+	return 1
+}
+
+func init() {
+	utils.RegisterCommand(&ResourcePackCMD{})
+}
diff --git a/ui/gui/gui.go b/ui/gui/gui.go
index 1937569..6dc3ad2 100644
--- a/ui/gui/gui.go
+++ b/ui/gui/gui.go
@@ -1,4 +1,4 @@
-//go:build gui || android
+//go:build gui || android || true
 
 package gui
 
@@ -16,7 +16,7 @@ import (
 )
 
 var settings = map[string]func(utils.Command) *widget.Form{
-	"world": func(cc utils.Command) *widget.Form {
+	"worlds": func(cc utils.Command) *widget.Form {
 		c := cc.(*world.WorldCMD)
 		return widget.NewForm(
 			widget.NewFormItem(
@@ -71,6 +71,18 @@ var settings = map[string]func(utils.Command) *widget.Form{
 			),
 		)
 	},
+	"packs": func(cc utils.Command) *widget.Form {
+		c := cc.(*subcommands.ResourcePackCMD)
+		return widget.NewForm(
+			widget.NewFormItem(
+				"serverAddress", widget.NewEntryWithData(binding.BindString(&c.ServerAddress)),
+			), widget.NewFormItem(
+				"", widget.NewCheckWithData("saveEncrypted", binding.BindBool(&c.SaveEncrypted)),
+			), widget.NewFormItem(
+				"", widget.NewCheckWithData("only-keys", binding.BindBool(&c.OnlyKeys)),
+			),
+		)
+	},
 }
 
 type GUI struct {
diff --git a/utils/realms.go b/utils/realms.go
index 7deb883..6021899 100644
--- a/utils/realms.go
+++ b/utils/realms.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"strings"
 
-	"fyne.io/fyne/v2/widget"
 	"github.com/bedrock-tool/bedrocktool/locale"
 	"github.com/google/subcommands"
 	"github.com/sirupsen/logrus"
@@ -40,14 +39,6 @@ func (*RealmListCMD) Synopsis() string { return locale.Loc("list_realms_synopsis
 
 func (c *RealmListCMD) SetFlags(f *flag.FlagSet) {}
 
-func (c *RealmListCMD) SettingsUI() *widget.Form {
-	return nil
-}
-
-func (c *RealmListCMD) MainWindow() error {
-	return nil
-}
-
 func (c *RealmListCMD) Usage() string {
 	return c.Name() + ": " + c.Synopsis() + "\n"
 }
diff --git a/utils/resourcepack-ace.go b/utils/resourcepack-ace.go
deleted file mode 100644
index 9960ac9..0000000
Binary files a/utils/resourcepack-ace.go and /dev/null differ
diff --git a/utils/utils.go b/utils/utils.go
index 0574d97..e32aac1 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -4,6 +4,7 @@ package utils
 import (
 	"bytes"
 	"context"
+	"crypto/aes"
 	"crypto/sha256"
 	"encoding/json"
 	"errors"
@@ -177,3 +178,20 @@ func WriteManifest(manifest *resource.Manifest, fpath string) error {
 	}
 	return nil
 }
+
+func CfbDecrypt(data []byte, key []byte) ([]byte, error) {
+	cipher, err := aes.NewCipher([]byte(key))
+	if err != nil {
+		return nil, err
+	}
+
+	shiftRegister := append(key[:16], data...)
+	iv := make([]byte, 16)
+	off := 0
+	for ; off < len(data); off += 1 {
+		cipher.Encrypt(iv, shiftRegister)
+		data[off] ^= iv[0]
+		shiftRegister = shiftRegister[1:]
+	}
+	return data, nil
+}