Pitfalls of Network Drives and UNC Paths — Working With File Servers (Shared Folders) From a Business Application (archived 2026-07-27)

This article organizes the classic problems that show up when a business application writes to or watches a shared folder: why a drive letter (Z:) is invisible from a service, the permissions each service execution account needs, error 1219, and the caveats around FileSystemWatcher. Archived version of https://comcomponent.com/en/blog/network-share-unc-path-pitfalls/, as published on 2026-07-27. The live article is maintained and may change after this date. First published 2026-07-17.