proton: Add workaround for FFXIV to enable old launcher by default.

CW-Bug-Id: #19609

proton

@@ -670,6 +670,26 @@ class CompatData:
                 os.remove(old)
                 os.symlink(src=link, dst=old)
 
+    def ffxiv_workaround(self):
+        if not "SteamGameId" in os.environ or \
+                os.environ["SteamGameId"] != "39210":
+            return
+
+        config_dir = self.prefix_dir + "drive_c/users/steamuser/My Documents/My Games/FINAL FANTASY XIV - A Realm Reborn/"
+        config_file = config_dir + "FFXIV_BOOT.cfg"
+
+        if os.path.exists(config_file):
+            with open(config_file, "r") as file:
+                config_content = file.read()
+            config_content = config_content.replace("Browser\t2", "Browser\t1")
+            with open(config_file, "w") as file:
+                file.write(config_content)
+        else:
+            config_content = "<FINAL FANTASY XIV Boot Config File>\n\n<Version>\nBrowser\t1\n"
+            makedirs(config_dir)
+            with open(config_file, "w") as file:
+                file.write(config_content)
+
     def setup_prefix(self):
         with self.prefix_lock:
             if os.path.exists(self.version_file):
@@ -763,6 +783,8 @@ class CompatData:
             #create font files symlinks
             self.create_fonts_symlinks()
 
+            self.ffxiv_workaround()
+
             with open(self.tracked_files_file, "a") as tracked_files:
                 #copy steam files into place
                 steam_dir = "drive_c/Program Files (x86)/Steam/"