diff --git a/wfassoc/src/highlevel.rs b/wfassoc/src/highlevel.rs
index f3d70f3..5dea570 100644
--- a/wfassoc/src/highlevel.rs
+++ b/wfassoc/src/highlevel.rs
@@ -282,15 +282,21 @@ impl Program {
 // region: Program Internals
 
 /// Internal used enum presenting a Program string resource.
-type ProgramStr = lowlevel::LosseStrRefStr;
+#[derive(Debug)]
+struct ProgramStr {
+    inner: lowlevel::LosseStrRefStr,
+}
 
 /// Internal used enum presenting a Program icon resource.
-type ProgramIcon = lowlevel::LosseIconRefStr;
+#[derive(Debug)]
+struct ProgramIcon {
+    inner: lowlevel::LosseIconRefStr,
+}
 
 /// Internal used enum presenting a Program behavior (command line setups).
 #[derive(Debug)]
 struct ProgramBehavior {
-    inner: String,
+    inner: win32::concept::CmdLine,
 }
 
 /// Internal used struct presenting a Program ProgId.