diff --git a/crates/libs/core/src/imp/factory_cache.rs b/crates/libs/core/src/imp/factory_cache.rs
index eb4b2dac0e..62085a1b73 100644
--- a/crates/libs/core/src/imp/factory_cache.rs
+++ b/crates/libs/core/src/imp/factory_cache.rs
@@ -16,6 +16,12 @@ impl<C, I> FactoryCache<C, I> {
     }
 }
 
+impl<C, I> Default for FactoryCache<C, I> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<C: crate::RuntimeName, I: Interface> FactoryCache<C, I> {
     pub fn call<R, F: FnOnce(&I) -> crate::Result<R>>(&self, callback: F) -> crate::Result<R> {
         loop {
diff --git a/crates/libs/core/src/param.rs b/crates/libs/core/src/param.rs
index cd16d473f2..5061d41c0b 100644
--- a/crates/libs/core/src/param.rs
+++ b/crates/libs/core/src/param.rs
@@ -91,3 +91,15 @@ impl IntoParam<PCWSTR> for &HSTRING {
         Param::Owned(PCWSTR(self.as_ptr()))
     }
 }
+
+impl IntoParam<PCWSTR> for PWSTR {
+    unsafe fn into_param(self) -> Param<PCWSTR> {
+        Param::Owned(PCWSTR(self.0))
+    }
+}
+
+impl IntoParam<PCSTR> for PSTR {
+    unsafe fn into_param(self) -> Param<PCSTR> {
+        Param::Owned(PCSTR(self.0))
+    }
+}
diff --git a/crates/tests/string_param/Cargo.toml b/crates/tests/string_param/Cargo.toml
index 87df5ff40a..929589de05 100644
--- a/crates/tests/string_param/Cargo.toml
+++ b/crates/tests/string_param/Cargo.toml
@@ -8,4 +8,5 @@ publish = false
 path = "../../libs/windows"
 features = [
     "Win32_Foundation",
+    "Win32_UI_Shell",
 ]
diff --git a/crates/tests/string_param/tests/pwstr.rs b/crates/tests/string_param/tests/pwstr.rs
index 8d4ad40715..2510c9a889 100644
--- a/crates/tests/string_param/tests/pwstr.rs
+++ b/crates/tests/string_param/tests/pwstr.rs
@@ -1,7 +1,7 @@
-use windows::{core::*, Win32::Foundation::*};
+use windows::{core::*, Win32::Foundation::*, Win32::UI::Shell::*};
 
 #[test]
-fn test() {
+fn error() {
     unsafe {
         SetLastError(ERROR_BUSY_DRIVE);
 
@@ -15,3 +15,16 @@ fn test() {
         assert_eq!(GetLastError(), ERROR_BUSY_DRIVE);
     }
 }
+
+#[test]
+fn convert() {
+    unsafe {
+        let pcwstr: PCWSTR = w!("https://github.com/microsoft");
+        let pwstr = PWSTR(pcwstr.0 as _);
+        let pcstr: PCSTR = s!("https://github.com/microsoft");
+        let pstr = PSTR(pcstr.0 as _);
+
+        assert_eq!(0, UrlCompareW(pcwstr, pwstr, true));
+        assert_eq!(0, UrlCompareA(pcstr, pstr, true));
+    }
+}