- 导出工程文件: the in-app dialog only picks the format (OTIO / OVE / FCPXML); OK asks the system save dialog with the suggested file name carrying the format's extension, then exports - 打开项目: the system open dialog restricts the choosable files to .ove/.ovexml/.otio/.fcpxml (PathPromptOptions.allowed_extensions plumbed through gpui; Linux portal glob filter)