diff --git a/cap-primitives/src/windows/fs/open_impl.rs b/cap-primitives/src/windows/fs/open_impl.rs
index 1ba38e66..db595385 100644
--- a/cap-primitives/src/windows/fs/open_impl.rs
+++ b/cap-primitives/src/windows/fs/open_impl.rs
@@ -10,12 +10,14 @@ pub(crate) fn open_impl(
 ) -> io::Result<fs::File> {
     // Windows reserves several special device paths. Disallow opening any
     // of them.
+    // See: https://learn.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions
     if let Some(stem) = path.file_stem() {
         if let Some(stemstr) = stem.to_str() {
             match stemstr.to_uppercase().as_str() {
                 "CON" | "PRN" | "AUX" | "NUL" | "COM0" | "COM1" | "COM2" | "COM3" | "COM4"
-                | "COM5" | "COM6" | "COM7" | "COM8" | "COM9" | "LPT0" | "LPT1" | "LPT2"
-                | "LPT3" | "LPT4" | "LPT5" | "LPT6" | "LPT7" | "LPT8" | "LPT9" => {
+                | "COM5" | "COM6" | "COM7" | "COM8" | "COM9" | "COM¹" | "COM²" | "COM³"
+                | "LPT0" | "LPT1" | "LPT2" | "LPT3" | "LPT4" | "LPT5" | "LPT6" | "LPT7"
+                | "LPT8" | "LPT9" | "LPT¹" | "LPT²" | "LPT³" => {
                     return Err(io::Error::from_raw_os_error(ERROR_FILE_NOT_FOUND as i32));
                 }
                 _ => {}