diff --git a/wfassoc/src/highlevel.rs b/wfassoc/src/highlevel.rs
index 1b51cd0..f3d70f3 100644
--- a/wfassoc/src/highlevel.rs
+++ b/wfassoc/src/highlevel.rs
@@ -282,18 +282,10 @@ impl Program {
 // region: Program Internals
 
 /// Internal used enum presenting a Program string resource.
-#[derive(Debug)]
-enum ProgramStr {
-    Plain(String),
-    RefStr(win32::concept::StrRefStr)
-}
+type ProgramStr = lowlevel::LosseStrRefStr;
 
 /// Internal used enum presenting a Program icon resource.
-#[derive(Debug)]
-enum ProgramIcon {
-    Plain(String),
-    RefStr(win32::concept::IconRefStr)
-}
+type ProgramIcon = lowlevel::LosseIconRefStr;
 
 /// Internal used enum presenting a Program behavior (command line setups).
 #[derive(Debug)]
diff --git a/wfassoc/src/lowlevel.rs b/wfassoc/src/lowlevel.rs
index 6970cc7..6cfcb3f 100644
--- a/wfassoc/src/lowlevel.rs
+++ b/wfassoc/src/lowlevel.rs
@@ -561,18 +561,18 @@ impl ApplicationsKey {
             .ok_or(Error::InexistantKey)
     }
 
-    const NAMEOF_DEFAULT_BEHAVIOR_PART1: &str = "shell";
-    const NAMEOF_DEFAULT_BEHAVIOR_PART3: &str = "command";
+    const NAMEOF_SHELL_VERB_PART1: &str = "shell";
+    const NAMEOF_SHELL_VERB_PART3: &str = "command";
 
     // TODO:
     // We temporarily use String and &str as the command line argument parameter.
     // We may introduce a new complete Rust struct for replacing this arbitrary string.
 
-    pub fn get_default_behavior(&self, view: View) -> Result<(concept::Verb, String), Error> {
+    pub fn get_shell_verb(&self, view: View) -> Result<(concept::Verb, String), Error> {
         todo!()
     }
 
-    pub fn set_default_behavior(
+    pub fn set_shell_verb(
         &mut self,
         scope: Scope,
         beh: (concept::Verb, &str),
@@ -582,11 +582,41 @@ impl ApplicationsKey {
 
     const NAMEOF_DEFAULT_ICON: &str = "DefaultIcon";
 
-    pub fn get_default_icon(&self, view: View) -> Result<(), Error> {
+    pub fn get_default_icon(&self, view: View) -> Result<Option<LosseIconRefStr>, Error> {
         todo!()
     }
 
-    pub fn set_default_icon(&self, scope: Scope, icon: ()) -> Result<(), Error> {
+    pub fn set_default_icon(&self, scope: Scope, icon: Option<&LosseIconRefStr>) -> Result<(), Error> {
+        todo!()
+    }
+
+    const NAMEOF_FRIENDLY_APP_NAME: &str = "FriendlyAppName";
+
+    pub fn get_friendly_app_name(&self, view: View) -> Result<Option<LosseStrRefStr>, Error> {
+        todo!()
+    }
+
+    pub fn set_friendly_app_name(&self, scope: Scope, name: Option<&LosseStrRefStr>) -> Result<(), Error> {
+        todo!()
+    }
+
+    const NAMEOF_SUPPORTED_TYPES: &str = "SupportedTypes";
+
+    pub fn get_supported_types(&self, view: View) -> Result<Option<Vec<concept::Ext>>, Error> {
+        todo!()
+    }
+
+    pub fn set_supported_types(&self, scope: Scope, tys: Option<&[concept::Ext]>) -> Result<(), Error> {
+        todo!()
+    }
+
+    const NAMEOF_NO_OPEN_WITH: &str = "NoOpenWith";
+
+    pub fn get_no_open_with(&self, view: View) -> Result<bool, Error> {
+        todo!()
+    }
+
+    pub fn set_no_open_with(&self, scope: Scope, flag: bool) -> Result<(), Error> {
         todo!()
     }
 }