diff --git a/preload.js b/preload.js
index 00be9ac..e69c810 100644
--- a/preload.js
+++ b/preload.js
@@ -1,9 +1,10 @@
-const { contextBridge, ipcRenderer } = require('electron');
+const { contextBridge, ipcRenderer, webUtils } = require('electron');
 
 contextBridge.exposeInMainWorld('api', {
   selectFolder: () => ipcRenderer.invoke('select-folder'),
   selectZip: () => ipcRenderer.invoke('select-zip'),
   processDroppedPath: (path) => ipcRenderer.invoke('process-dropped-path', { path }),
+  getPathForDroppedFile: (file) => webUtils.getPathForFile(file),
   getDestination: () => ipcRenderer.invoke('get-destination'),
   selectDestinationFolder: () => ipcRenderer.invoke('select-destination-folder'),
   updateDestination: (destination) => ipcRenderer.invoke('update-destination', { destination }),
diff --git a/renderer/renderer.js b/renderer/renderer.js
index 0076468..2a8255a 100644
--- a/renderer/renderer.js
+++ b/renderer/renderer.js
@@ -106,8 +106,15 @@ dropZone.addEventListener('drop', async (event) => {
   event.preventDefault();
   dropZone.classList.remove('active');
 
-  const droppedFile = event.dataTransfer?.files?.[0];
-  const droppedPath = droppedFile?.path;
+  const droppedFile = event.dataTransfer?.files?.[0] || event.dataTransfer?.items?.[0]?.getAsFile?.();
+  let droppedPath = '';
+  if (droppedFile) {
+    try {
+      droppedPath = window.api.getPathForDroppedFile(droppedFile) || droppedFile.path || '';
+    } catch {
+      droppedPath = '';
+    }
+  }
 
   if (!droppedPath) {
     setDropZoneError('Elemento non valido. Trascina una cartella o un file .zip');
diff --git a/services/router.js b/services/router.js
index 5370a20..8ae1f94 100644
--- a/services/router.js
+++ b/services/router.js
@@ -1,15 +1,21 @@
 const path = require('path');
 
+function getCadType(filename) {
+  const baseName = path.basename(filename).toLowerCase();
+  const match = baseName.match(/\.(prt|asm|drw|dwr)(?:\.\d+)?$/);
+  return match ? match[1] : null;
+}
+
 function findDestination(filename, config) {
-  const ext = path.extname(filename).slice(1).toLowerCase();
+  const cadType = getCadType(filename);
   const globalDestination = typeof config?.destination === 'string' ? config.destination.trim() : '';
 
-  if (globalDestination && ['prt', 'asm', 'dwr'].includes(ext)) {
+  if (globalDestination && cadType) {
     return globalDestination;
   }
 
   for (const rule of config.rules || []) {
-    if ((rule.ext || '').toLowerCase() !== ext) {
+    if ((rule.ext || '').toLowerCase() !== cadType) {
       continue;
     }
 
@@ -27,8 +33,7 @@ function findDestination(filename, config) {
 }
 
 function isCadFile(filename) {
-  const ext = path.extname(filename).slice(1).toLowerCase();
-  return ['prt', 'asm', 'dwr'].includes(ext);
+  return Boolean(getCadType(filename));
 }
 
 module.exports = { findDestination, isCadFile };