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Open links to local files
How to open links to local files from the Web Client (Windows + Firefox).
HOW-TO ADMIN / OPERATIONS STAND: JUL 2026 GILT FUER NUCLOS 4.2026.X
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The Web Client can open links via hyperlink fields. For security reasons modern browsers block links to local files (file protocol). Below is the setup for Windows + Firefox.
Example
Example: c:\Users\foo\bar.csv is opened as file:///c:/Users/foo/bar.csv.
Firefox security settings
In the profile directory (%appdata%\Mozilla\Firefox\Profiles\{profileId}) create or extend user.js:
user_pref("capability.policy.policynames", "localfilelinks");
// mit Leerzeichen getrennte Liste der Hosts (mit Port)
user_pref("capability.policy.localfilelinks.sites", "http://localhost:8120");
user_pref("capability.policy.localfilelinks.checkloaduri.enabled", "allAccess");
// schaltet den Firefox-eigenen Handler fuer das Protokoll "file" aus
user_pref("network.protocol-handler.expose.file", false);
Choose the default program
On the first click of a file link, Firefox asks for a program – choose Windows Explorer (c:\Windows\explorer.exe) and enable „Remember my choice for file links“.
Program selection in Firefox.
Afterwards each click on a local link opens Explorer directly.
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