diff --git a/pkg/ipa/ipa.go b/pkg/ipa/ipa.go
index 9bca61c..6370f7c 100644
--- a/pkg/ipa/ipa.go
+++ b/pkg/ipa/ipa.go
@@ -99,6 +99,11 @@ func (a App) File(name string) *zip.File {
 	return nil
 }
 
+func (a App) FileBytes(name string) ([]byte, error) {
+	target := path.Join(a.dir(), name)
+	return a.p.FileBytes(target)
+}
+
 func (a App) Plist() (*Plist, error) {
 	b, err := a.p.FileBytes(path.Join(a.dir(), "Info.plist"))
 	if err != nil {
diff --git a/pkg/ipa/ipa_test.go b/pkg/ipa/ipa_test.go
index 0e9510b..3a86a8c 100644
--- a/pkg/ipa/ipa_test.go
+++ b/pkg/ipa/ipa_test.go
@@ -62,4 +62,12 @@ func TestOpen_gomobileipfsdemo(t *testing.T) {
 		UISupportedInterfaceOrientations: []string{"UIInterfaceOrientationPortrait", "UIInterfaceOrientationLandscapeLeft"},
 	}
 	require.Equal(t, plist, expected)
+
+	noExists, err := app.FileBytes("blahblah")
+	require.Nil(t, noExists)
+	require.Error(t, err)
+
+	exists, err := app.FileBytes("Frameworks/libswiftFoundation.dylib")
+	require.NoError(t, err)
+	require.Equal(t, len(exists), 8479536)
 }