diff --git a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt
index f614dac..cb64595 100644
--- a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt
+++ b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeFragment.kt
@@ -43,7 +43,11 @@ class HomeFragment : AppFragment(), HomeAdapter.Listener, MenuProvider {
     }
 
     private val save = registerForActivityResult(CreateDocument("application/x-pkcs7-certificates")) {
-        viewModel.save(requireContext().contentResolver, it)
+        viewModel.save(requireContext().contentResolver, it, "PKCS7")
+    }
+
+    private val save2 = registerForActivityResult(CreateDocument("application/pkix-pkipath")) {
+        viewModel.save(requireContext().contentResolver, it, "PkiPath")
     }
 
     private val load = registerForActivityResult(OpenDocument()) {
@@ -167,6 +171,7 @@ class HomeFragment : AppFragment(), HomeAdapter.Listener, MenuProvider {
             isChecked = viewModel.preferShowAll
         }
         menu.findItem(R.id.menu_save).isVisible = viewModel.currentCerts != null
+        menu.findItem(R.id.menu_save2).isVisible = viewModel.currentCerts != null
     }
 
     override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
@@ -202,6 +207,9 @@ class HomeFragment : AppFragment(), HomeAdapter.Listener, MenuProvider {
             R.id.menu_save -> {
                 save.launch("${Build.PRODUCT}-${AppApplication.TAG}.p7b")
             }
+            R.id.menu_save2 -> {
+                save2.launch("${Build.PRODUCT}-${AppApplication.TAG}.pkipath")
+            }
             R.id.menu_load -> {
                 load.launch(arrayOf("application/*"))
             }
diff --git a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt
index d83c32f..13e4401 100644
--- a/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt
+++ b/app/src/main/java/io/github/vvb2060/keyattestation/home/HomeViewModel.kt
@@ -185,7 +185,7 @@ class HomeViewModel(pm: PackageManager, private val sp: SharedPreferences) : Vie
         return parseCertificateChain(certs)
     }
 
-    fun save(cr: ContentResolver, uri: Uri?) = AppApplication.executor.execute {
+    fun save(cr: ContentResolver, uri: Uri?, encoding: String) = AppApplication.executor.execute {
         val certs = currentCerts
         if (uri == null || certs == null) return@execute
         var name = uri.toString()
@@ -199,7 +199,7 @@ class HomeViewModel(pm: PackageManager, private val sp: SharedPreferences) : Vie
         try {
             val cf = CertificateFactory.getInstance("X.509")
             cr.openOutputStream(uri)?.use {
-                it.write(cf.generateCertPath(certs).getEncoded("PKCS7"))
+                it.write(cf.generateCertPath(certs).getEncoded(encoding))
             } ?: throw IOException("openOutputStream $uri failed")
             AppApplication.mainHandler.post {
                 Toast.makeText(AppApplication.app, name, Toast.LENGTH_SHORT).show()
diff --git a/app/src/main/res/menu/home.xml b/app/src/main/res/menu/home.xml
index 63f468d..790988b 100644
--- a/app/src/main/res/menu/home.xml
+++ b/app/src/main/res/menu/home.xml
@@ -30,6 +30,11 @@
         android:showAsAction="never"
         android:title="@string/save_certs" />
 
+    <item
+        android:id="@+id/menu_save2"
+        android:showAsAction="never"
+        android:title="@string/save_certs2" />
+
     <item
         android:id="@+id/menu_load"
         android:showAsAction="never"
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 6eabda8..76d0287 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -6,7 +6,8 @@
     <string name="attest_device_props">认证设备属性</string>
     <string name="show_all">显示全部</string>
     <string name="load_certs">从文件加载</string>
-    <string name="save_certs">保存到文件</string>
+    <string name="save_certs">保存到文件（p7b）</string>
+    <string name="save_certs2">保存到文件（pkipath）</string>
     <string name="about">关于</string>
     <string name="open_source_info"><![CDATA[
 此软件是 %2$s 下的开源软件（%1$s）。
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 8b13885..5e0f1d7 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -6,7 +6,8 @@
     <string name="attest_device_props">Attest device props</string>
     <string name="show_all">Show all</string>
     <string name="load_certs">Load from file</string>
-    <string name="save_certs">Save to file</string>
+    <string name="save_certs">Save to file (p7b)</string>
+    <string name="save_certs2">Save to file (pkipath)</string>
     <string name="about">About</string>
     <string name="open_source_info"><![CDATA[
 This software is open source under %2$s (%1$s).