大修复与优化版本：
对于 1.2.0 Release 版本，更新以下内容：
- 修复设为默认程序打开时文件不存在报错
- 修复重复保存漏洞
- 优化保存未命名文件时选择文件夹
- 打开文件、保存文件文件夹自动记忆
Major fixes and optimizations:
For 1.2.0 Release, update the following:
- Fixed the error that the file does not exist when the default program is opened
- Fixed the duplicate save vulnerability
- Optimize folder selection when saving unnamed files
- Open files, save files folder automatic memory
Full Changelog: v1.2.0...v1.2.3