diff --git a/apps/red-ui/src/app/modules/file-preview/components/pdf-viewer/pdf-viewer.component.ts b/apps/red-ui/src/app/modules/file-preview/components/pdf-viewer/pdf-viewer.component.ts
index d1abb67d5..d6355694b 100644
--- a/apps/red-ui/src/app/modules/file-preview/components/pdf-viewer/pdf-viewer.component.ts
+++ b/apps/red-ui/src/app/modules/file-preview/components/pdf-viewer/pdf-viewer.component.ts
@@ -554,7 +554,7 @@ export class PdfViewerComponent extends AutoUnsubscribe implements OnInit, OnCha
     }
 
     private _loadDocument(blob: Blob, file: File) {
-        this.instance.UI.loadDocument(blob, { filename: file?.filename ?? 'document.pdf' });
+        this.instance.UI.loadDocument(blob, { filename: file?.filename + '.pdf' ?? 'document.pdf' });
         this._pageRotationService.clearRotationsHideActions();
     }
 
diff --git a/apps/red-ui/src/app/utils/file-drop-utils.ts b/apps/red-ui/src/app/utils/file-drop-utils.ts
index c816d93d8..80ea60072 100644
--- a/apps/red-ui/src/app/utils/file-drop-utils.ts
+++ b/apps/red-ui/src/app/utils/file-drop-utils.ts
@@ -1,10 +1,27 @@
 import { FileUploadModel } from '@upload-download/model/file-upload.model';
 import { Dossier } from '@red/domain';
 
+const validDocumentMimeTypes = [
+    'application/msword',
+    'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+    'application/vnd.ms-excel',
+    'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+    'application/vnd.ms-powerpoint',
+    'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+    'application/pdf',
+];
+
+const validDocumentExtensions = ['doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx', 'pdf'];
+
 export function isCsv(file: FileUploadModel): boolean {
     return file.file.type?.toLowerCase() === 'text/csv' || file.file.name.toLowerCase().endsWith('.csv');
 }
 
+export function isDocument(file: FileUploadModel): boolean {
+    const extension = file.file.name.toLowerCase().substring(file.file.name.toLowerCase().lastIndexOf('.') + 1);
+    return validDocumentMimeTypes.includes(file.file.type?.toLowerCase()) || validDocumentExtensions.includes(extension);
+}
+
 export type Files = FileList | File[];
 
 export function convertFiles(files: FileList | File[], dossier: Dossier): FileUploadModel[] {
@@ -30,6 +47,7 @@ export function convertFiles(files: FileList | File[], dossier: Dossier): FileUp
             file.file.name.toLowerCase().endsWith('.pdf') ||
             file.file.type?.toLowerCase() === 'application/zip' ||
             file.file.name.toLowerCase().endsWith('.zip') ||
+            isDocument(file) ||
             isCsv(file),
     );