diff --git a/File Converter b/File Converter
index ae8812e..dd9ce85 100644
--- a/File Converter	
+++ b/File Converter	
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# IMPORTANT: Ensure xournalpp is installed and in your PATH for .xopp conversions.
+# For example, on Debian/Ubuntu: sudo apt install xournalpp
+
 FILES=$(echo -e "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS")
 
 if [ -z "$FILES" ]; then
@@ -11,6 +14,8 @@ first_file=$(echo "$FILES" | head -n1)
 EXT="${first_file##*.}"
 EXT_LOWER=$(echo "$EXT" | tr '[:upper:]' '[:lower:]')
 
+# Determine the primary category of the selected files based on the first file
+MIME_CATEGORY=""
 case "$EXT_LOWER" in
     jpg|jpeg|png|webp)
         MIME_CATEGORY="image"
@@ -18,6 +23,9 @@ case "$EXT_LOWER" in
     pdf)
         MIME_CATEGORY="pdf"
         ;;
+    xopp) # NEW: Xournal++ file category
+        MIME_CATEGORY="xopp"
+        ;;
     mp3|ogg|wav|flac)
         MIME_CATEGORY="audio"
         ;;
@@ -25,16 +33,21 @@ case "$EXT_LOWER" in
         MIME_CATEGORY="video"
         ;;
     *)
-        zenity --error --text="Unsupported file extension :("
+        zenity --error --text="Unsupported file extension for the first selected file: .$EXT"
         exit 1
         ;;
 esac
 
+# Define conversion options based on the determined MIME_CATEGORY
+OPTIONS=""
 case "$MIME_CATEGORY" in
     image)
         OPTIONS="JPEG\tjpg\nPNG\tpng\nWEBP\twebp\nPDF\tpdf"
         ;;
     pdf)
+        OPTIONS="PDF\tpdf" # PDF files can only be output as PDF in this script's current logic
+        ;;
+    xopp) # NEW: Options for Xournal++ files
         OPTIONS="PDF\tpdf"
         ;;
     audio)
@@ -45,13 +58,14 @@ case "$MIME_CATEGORY" in
         ;;
 esac
 
+# Prompt user for output format
 OUTPUT_EXT=$(zenity --list \
     --title="Convert $MIME_CATEGORY files" \
     --print-column=2 \
     --column="Format" --column="Extension" \
     $(echo -e "$OPTIONS"))
 
-if [ -z "$OUTPUT_EXT" ]; then exit 0; fi
+if [ -z "$OUTPUT_EXT" ]; then exit 0; fi # User cancelled
 
 QUALITY=""
 case "$OUTPUT_EXT" in
@@ -64,6 +78,7 @@ case "$OUTPUT_EXT" in
     mp4|webm|avi|mkv)
         QUALITY=$(zenity --scale --title="Select video bitrate (kbps)" --min-value=500 --max-value=5000 --value=2000 --step=100)
         ;;
+    # No quality prompt for PDF or XOPP
 esac
 
 total=$(echo "$FILES" | wc -l)
@@ -83,6 +98,9 @@ for FILE in $FILES; do
 
     EXT="${FILE##*.}"
     EXT_LOWER=$(echo "$EXT" | tr '[:upper:]' '[:lower:]')
+
+    # Determine the category of the CURRENT file in the loop
+    FILE_CATEGORY="unknown"
     case "$EXT_LOWER" in
         jpg|jpeg|png|webp)
             FILE_CATEGORY="image"
@@ -90,15 +108,15 @@ for FILE in $FILES; do
         pdf)
             FILE_CATEGORY="pdf"
             ;;
-        mp3|ogg|wav)
+        xopp) # NEW: Detect xopp for individual file processing
+            FILE_CATEGORY="xopp"
+            ;;
+        mp3|ogg|wav|flac) # Note: 'flac' input is audio but output options might be limited
             FILE_CATEGORY="audio"
             ;;
         mp4|webm|avi|mkv)
             FILE_CATEGORY="video"
             ;;
-        *)
-            FILE_CATEGORY="unknown"
-            ;;
     esac
 
     if [ "$FILE_CATEGORY" = "unknown" ]; then
@@ -108,13 +126,21 @@ for FILE in $FILES; do
 
     # Run commands with error output visible (not silent)
     case "$FILE_CATEGORY" in
-        image|pdf)
+        image|pdf) # ImageMagick's convert can handle images and PDF inputs
             if [ -n "$QUALITY" ] && [[ "$OUTPUT_EXT" == jpg || "$OUTPUT_EXT" == jpeg ]]; then
                 convert "$FILE" -quality "$QUALITY" "$OUTPUT_PATH" || echo "Failed to convert $FILE" >&2
             else
                 convert "$FILE" "$OUTPUT_PATH" || echo "Failed to convert $FILE" >&2
             fi
             ;;
+        xopp) # NEW: Handle Xournal++ to PDF conversion
+            if [ "$OUTPUT_EXT" = "pdf" ]; then
+                # xournalpp <output_pdf> <input_xopp>
+                xournalpp -p "$OUTPUT_PATH" "$FILE" || echo "Failed to convert $FILE" >&2
+            else
+                echo "Skipping $FILE: XOPP files can only be converted to PDF." >&2
+            fi
+            ;;
         audio)
             if [ -n "$QUALITY" ]; then
                 ffmpeg -loglevel error -y -i "$FILE" -b:a "${QUALITY}k" "$OUTPUT_PATH" || echo "Failed to convert $FILE" >&2
@@ -124,14 +150,14 @@ for FILE in $FILES; do
             ;;
         video)
             case "$OUTPUT_EXT" in
-                mp3|ogg|wav)
+                mp3|ogg|wav|flac) # Convert video to audio
                     if [ -n "$QUALITY" ]; then
                         ffmpeg -loglevel error -y -i "$FILE" -vn -b:a "${QUALITY}k" "$OUTPUT_PATH" || echo "Failed to convert $FILE" >&2
                     else
                         ffmpeg -loglevel error -y -i "$FILE" -vn "$OUTPUT_PATH" || echo "Failed to convert $FILE" >&2
                     fi
                     ;;
-                *)
+                *) # Convert video to another video format
                     if [ -n "$QUALITY" ]; then
                         ffmpeg -loglevel error -y -i "$FILE" -b:v "${QUALITY}k" "$OUTPUT_PATH" || echo "Failed to convert $FILE" >&2
                     else