Trilium widget to open italicized file paths. Only works in Desktop app. Add as "JS Frontend" note and make sure it has the #widget property.

openfilepath.js

/* License: MIT https://opensource.org/licenses/MIT
 * Made by: GEOsens GmbH 2023 
 * 
 * Usage: Italicize the file path. The italicized file or folder can be opened with a double click.
 * 
 * Note: there is not indication that a path is clickable, thanks ckeditor.
 */

async function onClickOpenPath(event) {
    // check if event was on Italicised
    if (event.target.tagName == "I") {
        var path = event.target.innerText;
        // check if content is path (rudimentary)
        if (/[a-zA-Z]:.*|\\\\\w.*?\\\w/.test(path)) {
            // use backend to open file from path
            await document.PathLinkerApi.runOnBackend(async (path) => {
                const shell = require('electron').shell;
                await shell.openPath(path);
                return;
            }, [path]);
        }
    }
}

const TEMPLATE = `
<div style="padding: 10px; border-top: 1px solid var(--main-border-color); contain: none;">
<script>
${onClickOpenPath.toString()}
document.addEventListener('dblclick', onClickOpenPath);
</script>
</div>`;

class PathLinkerWidget extends api.NoteContextAwareWidget {
    constructor(...args) {
        super(...args);
        this.balloonEditorCreate = null;
    }
    
    get position() { 
        // higher value means position towards the bottom/right
        return 100; 
    } 

    get parentWidget() { return 'center-pane'; }

    doRender() {
        this.$widget = $(TEMPLATE);
        this.$widget.hide();
        
        // store API in document to access it from callback
        document.PathLinkerApi = api;
        return this.$widget;
    }
}

let widget = new PathLinkerWidget();
console.log("Loaded PathLinkerWidget");
module.exports = widget;

Add new update for the usage of this script.
16 line: await document.PathLinkerApi.runOnBackend(async (path) => {
need update to below
16 line: await document.PathLinkerApi.runAsyncOnBackendWithManualTransactionHandling(async (path) => {

This update is due to trilium app (win 0.62.5) notice me like below once i double click on the file link line.
ERROR: You're passing an async function to api.runOnBackend() which will likely not work as you intended. Either make the function synchronous (by removing 'async' keyword), or use api.runAsyncOnBackendWithManualTransactionHandling()