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craft-docpath follows a stored path only on this computer or on the share the document is on, but its check is lexical and cannot see mapped drives. fileio::document_path therefore followed a link stored as Y:\img\logo.png, where Y: is mapped to \\server\other, from any document: opening the document, links.check, Link Info and the linked-file watch read or stamped the file on that server. On Windows, document_path now reads the final path of the root folder of a link's drive (std::fs::canonicalize). Windows opens that root folder on the drive's server to answer, so the check still contacts the server once per lookup; no file on it is read, stamped or watched. When the final path names a share, the link is checked against the document's path on its share, and a link on another share is refused as on another computer, as a link stored with that share's own path is. Links on this computer's drives and on the document's share are followed as before, and a link on the document's own drive is not looked up. A document opened as \\?\Z:\... is looked up on its share as Z:\... is. Other systems are unchanged. Docs: docs/mcp.md, docs/target-app-parity.md.