This attempts to fix the error:

"Error processing game output: 'gbk' codec can't decode byte 0xac in
position 33: illegal multibyte sequence"
as reported by nicotomia from the audiogames.net forum.

Toby Doom Launcher.py

@@ -225,12 +225,26 @@ class SpeechHandler:
         
         while True:
             try:
-                line = process.stdout.readline()
-                # Keep gzdoom's existing functionality of lines being printed to the console.
-                print(line, end='')
-                if not line:
+                # Read raw bytes from stdout
+                rawLine = process.stdout.buffer.readline()
+                if not rawLine:
                     break
                 
+                # Try different encodings
+                for encoding in ['utf-8', 'latin1', 'cp1252']:
+                    try:
+                        line = rawLine.decode(encoding)
+                        break
+                    except UnicodeDecodeError:
+                        continue
+                else:
+                    # If all encodings fail, skip this line
+                    print(f"Warning: Could not decode line: {rawLine}", file=sys.stderr)
+                    continue
+                
+                # Keep gzdoom's existing functionality of lines being printed to the console
+                print(line, end='')
+                
                 lineStr = line.strip()
                 
                 # Wait for the initial separator before starting speech
@@ -245,7 +259,7 @@ class SpeechHandler:
                         
             except Exception as e:
                 print(f"Error processing game output: {e}", file=sys.stderr)
-                break
+                continue  # Continue processing instead of breaking
 
 
 class MenuDialog(QDialog):
@@ -1675,7 +1689,6 @@ class DoomLauncher(QMainWindow):
                     stdout=subprocess.PIPE,
                     stderr=subprocess.STDOUT,
                     bufsize=1,
-                    text=True,
                     env=dict(os.environ, PYTHONUNBUFFERED="1"),
                     startupinfo=startupinfo
                 )