# Open Launches a file selection window where you can open Audacity \*.aup4 Project files. You can also open \*.aup3 files if they have been created with a **compatible** version of Audacity 3. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://support.audacityteam.org/au4/manual/manual-index/header/file/open.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.