# File types restrictions The editor accepts multiple files at a time and limits the extensions to some predefined, common file types. You can change these settings in `Options -> Security`. Any file type can be added to the allowed extensions list. Even .php files, but you will get a warning indicating the security risk in doing so. Another important setting allows you to select who is limited by these extension list. You can enable the restriction for all users and clients, clients only or no one. --- # 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://docs.projectsend.org/about/how-to-use/files/file-types-restrictions.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.