diff --git a/src-tauri/src/commands/dialog.rs b/src-tauri/src/commands/dialog.rs
index ceb812f..5e8edce 100644
--- a/src-tauri/src/commands/dialog.rs
+++ b/src-tauri/src/commands/dialog.rs
@@ -4,7 +4,7 @@
 //! specifically for picking SSH key files.
 
 use rfd::FileDialog;
-use std::fs;
+use std::{fs, path::Path};
 
 /// Opens a file dialog to pick an SSH private key file.
 ///
@@ -18,9 +18,9 @@ use std::fs;
 /// or an error if the dialog failed to open.
 #[tauri::command]
 pub async fn pick_ssh_key_file() -> Result<Option<String>, String> {
+    // OpenSSH private keys commonly use names like `id_ed25519` with no extension,
+    // while rfd filters are extension-based and can hide them.
     let file = FileDialog::new()
-        .add_filter("SSH Keys", &["pem", "key", "pub", "ppk"])
-        .add_filter("All Files", &["*"])
         .set_title("Select SSH Private Key")
         .pick_file();
 
@@ -85,5 +85,29 @@ pub async fn pick_download_directory() -> Result<Option<String>, String> {
 /// Returns the file contents as a string, or an error if the file cannot be read.
 #[tauri::command]
 pub async fn read_ssh_key_file(path: String) -> Result<String, String> {
-    fs::read_to_string(&path).map_err(|e| format!("Failed to read SSH key file: {}", e))
+    read_ssh_key_file_content(path)
+}
+
+fn read_ssh_key_file_content(path: impl AsRef<Path>) -> Result<String, String> {
+    fs::read_to_string(path.as_ref()).map_err(|e| format!("Failed to read SSH key file: {}", e))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::read_ssh_key_file_content;
+
+    #[test]
+    fn reads_extensionless_private_key_files() {
+        let temp_dir = tempfile::tempdir().expect("temp dir should be created");
+        let key_path = temp_dir.path().join("id_ed25519");
+        let key_content =
+            "-----BEGIN OPENSSH PRIVATE KEY-----\nkey\n-----END OPENSSH PRIVATE KEY-----\n";
+
+        std::fs::write(&key_path, key_content).expect("extensionless key should be written");
+
+        assert_eq!(
+            read_ssh_key_file_content(&key_path).expect("extensionless key should be read"),
+            key_content
+        );
+    }
 }