diff --git a/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.spec.ts b/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.spec.ts
index 332ad747d9..a7a83948c1 100644
--- a/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.spec.ts
+++ b/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.spec.ts
@@ -569,6 +569,59 @@ describe('AlfrescoViewerComponent', () => {
             expect(component.mimeType).toEqual('application/pdf');
             expect(component.nodeMimeType).toEqual('application/msWord');
         });
+
+        describe('versioned file with rendition', () => {
+            const docxMimeType = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
+            const xlsxMimeType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
+            const nodeId = 'node-id';
+            const previousVersionId = '1.0';
+            const newVersionId = '2.0';
+
+            beforeEach(() => {
+                spyOn(component.versionsApi, 'getVersion').and.returnValue(
+                    Promise.resolve(
+                        new VersionEntry({
+                            entry: new Node({ id: newVersionId, name: 'file.docx', content: new ContentInfo({ mimeType: docxMimeType }) })
+                        })
+                    )
+                );
+                spyOn(renditionService, 'getNodeRendition').and.returnValue(Promise.resolve({ url: 'rendition-url', mimeType: 'application/pdf' }));
+
+                component.nodeId = nodeId;
+                component.versionId = previousVersionId;
+                component.showViewer = true;
+            });
+
+            it('should set nodeMimeType from versionData.content.mimeType, not nodeData.content.mimeType', fakeAsync(() => {
+                spyOn(component.nodesApi, 'getNode').and.returnValue(
+                    Promise.resolve(
+                        new NodeEntry({ entry: new Node({ id: nodeId, name: 'file.xlsx', content: new ContentInfo({ mimeType: xlsxMimeType }) }) })
+                    )
+                );
+
+                component.versionId = newVersionId;
+                component.ngOnChanges(getSimpleChangesWithVersion(nodeId, newVersionId, nodeId, previousVersionId));
+                tick();
+
+                expect(renditionService.getNodeRendition).toHaveBeenCalledWith(nodeId, newVersionId);
+                expect(component.mimeType).toBe('application/pdf');
+                expect(component.nodeMimeType).toBe(docxMimeType);
+            }));
+
+            it('should preserve nodeMimeType from versionData when nodeData has no content', fakeAsync(() => {
+                spyOn(component.nodesApi, 'getNode').and.returnValue(
+                    Promise.resolve(new NodeEntry({ entry: new Node({ id: nodeId, name: 'file.docx' }) }))
+                );
+
+                component.versionId = newVersionId;
+                component.ngOnChanges(getSimpleChangesWithVersion(nodeId, newVersionId, nodeId, previousVersionId));
+                tick();
+
+                expect(renditionService.getNodeRendition).toHaveBeenCalledWith(nodeId, newVersionId);
+                expect(component.mimeType).toBe('application/pdf');
+                expect(component.nodeMimeType).toBe(docxMimeType);
+            }));
+        });
     });
 
     describe('Toolbar', () => {
diff --git a/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.ts b/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.ts
index 19568831b7..86d53a7323 100644
--- a/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.ts
+++ b/lib/content-services/src/lib/viewer/components/alfresco-viewer.component.ts
@@ -314,7 +314,6 @@ export class AlfrescoViewerComponent implements OnChanges, OnInit {
     private async setUpNodeFile(nodeData: Node, versionData?: Version): Promise<void> {
         this.canEditNode = this.contentService.hasAllowableOperations(nodeData, 'update');
         let mimeType: string;
-        let nodeMimeType: string;
         let urlFileContent: string;
 
         if (versionData?.content) {
@@ -322,7 +321,7 @@ export class AlfrescoViewerComponent implements OnChanges, OnInit {
         } else if (nodeData.content) {
             mimeType = nodeData.content.mimeType;
         }
-        nodeMimeType = mimeType;
+        const nodeMimeType = mimeType;
 
         const currentFileVersion = this.nodeEntry?.entry?.properties?.['cm:versionLabel']
             ? encodeURI(this.nodeEntry?.entry?.properties['cm:versionLabel'])
@@ -344,7 +343,6 @@ export class AlfrescoViewerComponent implements OnChanges, OnInit {
             if (nodeRendition) {
                 urlFileContent = nodeRendition.url;
 
-                nodeMimeType = nodeData?.content?.mimeType;
                 const renditionMimeType = nodeRendition.mimeType;
                 mimeType = renditionMimeType || nodeMimeType;
             }