diff --git a/.rustfmt.toml b/.rustfmt.toml
index be300b2..1e3fc2f 100644
--- a/.rustfmt.toml
+++ b/.rustfmt.toml
@@ -1,2 +1,2 @@
 max_width = 80
-merge-imports = true
+merge_imports = true
diff --git a/src/error.rs b/src/error.rs
index 43bdd2e..932a11c 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -10,7 +10,7 @@ pub enum Error {
     BadCmd,
     #[error("could not locate config dir")]
     NoConfigDir,
-    #[error("could not figure out the mime from extension. please provide the mime type directly")]
+    #[error("could not figure out the mime type")]
     Ambiguous,
     #[error("either mime (via -m) or extension (via -e) must be provided")]
     MissingMimeOrExt,
diff --git a/src/main.rs b/src/main.rs
index 36aaa53..6ce582d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -69,14 +69,19 @@ fn main() -> Result<()> {
         Cmd::Open { path } => match url::Url::parse(&path) {
             Ok(url) => {
                 let mime = Mime(format!("x-scheme-handler/{}", url.scheme()));
-
                 apps.get_handler(&mime)?.open(path)?;
             }
             Err(_) => {
-                let guess = mime_guess::from_path(&path)
-                    .first_or_text_plain()
-                    .to_string();
-                apps.get_handler(&Mime(guess))?.open(path)?;
+                let mime = match mime_guess::from_path(&path).first_raw() {
+                    Some(mime) => mime,
+                    None if std::fs::metadata(&path)?.is_dir() => {
+                        "inode/directory"
+                    }
+                    _ => {
+                        return Err(Error::Ambiguous);
+                    }
+                };
+                apps.get_handler(&Mime(mime.to_owned()))?.open(path)?;
             }
         },
         Cmd::List => {