diff --git a/src/sheet.rs b/src/sheet.rs
index c0aeda9..15c420b 100644
--- a/src/sheet.rs
+++ b/src/sheet.rs
@@ -1,10 +1,12 @@
 use std::{
     cmp::Ordering,
+    ffi::OsStr,
     fs,
     path::{Path, PathBuf},
 };
 
 use chrono::{DateTime, Utc};
+use log::debug;
 use strum_macros::{EnumDiscriminants, EnumIter};
 
 pub trait PdfSheet {
@@ -49,10 +51,19 @@ impl Ord for Sheet {
 }
 
 impl Sheet {
-    pub fn open_file(&self) {
+    pub fn open_file_or_annotated_version_if_exists(&self) {
         let path = &self.pdf.path;
-        // TODO: open on first_page
-        opener::open(path).unwrap();
+
+        let mut annotated_path = path.with_extension("").into_os_string();
+        annotated_path.push("_annotated.pdf");
+        let annotated_version = Path::new(&annotated_path);
+        if annotated_version.exists() {
+            // TODO: open on first_page
+            opener::open(annotated_version).unwrap();
+        } else {
+            // TODO: open on first_page
+            opener::open(path).unwrap();
+        }
     }
 
     pub fn is_part_of_book(&self) -> bool {
diff --git a/src/sheet_validation.rs b/src/sheet_validation.rs
index fd47c4d..4ea7efa 100644
--- a/src/sheet_validation.rs
+++ b/src/sheet_validation.rs
@@ -64,6 +64,16 @@ fn validate_sheet_files(sheets: Vec<Sheet>, dir: impl AsRef<Path>) -> FileValida
 
     // TODO: improve performance?
     for pdf_file in find_all_pdfs_in_directory_recursive(dir) {
+        // Make sure annotated files are not handled (they are then only opened if existent)
+        if pdf_file
+            .file_name()
+            .unwrap()
+            .to_string_lossy()
+            .ends_with("_annotated.pdf")
+        {
+            continue;
+        }
+
         if let Some((i, _)) = invalidated_sheets
             .iter()
             .enumerate()
diff --git a/src/ui/app.rs b/src/ui/app.rs
index 2e9d78c..441655e 100644
--- a/src/ui/app.rs
+++ b/src/ui/app.rs
@@ -175,7 +175,7 @@ impl AsyncComponent for AppModel {
                             .forward(sender.input_sender(), |_| todo!()),
                     );
                 } else {
-                    sheet.open_file();
+                    sheet.open_file_or_annotated_version_if_exists();
                     let mut sheet = sheet;
                     sheet.last_opened = I64DateTime(Utc::now());
                     sheet_dao::update_sheet_last_opened(&self.database, &sheet)