– This suggests a custom application protocol. It is not a standard scheme like http , https , ftp , or file . Some applications, proxy servers, or old browser extensions define custom schemes to intercept or route requests. For example, a corporate VPN client might use proxy-url-file:// to represent “a file that should be fetched via a specific proxy.”
: This could imply accessing a local file through a proxy server. While proxies are typically used for accessing remote resources, configurations can allow for accessing local files. However, this use case is less common and might not be directly supported by all applications or proxy servers. proxy-url-file-3A-2F-2F-2F
The decoded title is: "proxy url file:///" – This suggests a custom application protocol
: Translate a local path (like C:\Users\Documents ) into a format the web engine understands without triggering "cross-origin" security blocks. For example, a corporate VPN client might use