diff --git a/src/extension/app/plugins/preview/preview.js b/src/extension/app/plugins/preview/preview.js
index 6b748835..5291a8ee 100644
--- a/src/extension/app/plugins/preview/preview.js
+++ b/src/extension/app/plugins/preview/preview.js
@@ -71,20 +71,20 @@ export function createPreviewPlugin(appStore) {
           const neitherGdocOrGSheet = !isGoogleDocMime && !isGoogleSheetMime;
 
           if (neitherGdocOrGSheet) {
-            const isMsDocMime = contentType === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
+            const isMsWordMime = contentType === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
             const isMsExcelSheet = contentType === 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
             let errorKey = 'error_preview_not_gdoc_generic'; // show generic message by default
 
             // istanbul ignore else
-            if (isMsDocMime) {
-              errorKey = 'error_preview_not_gdoc_ms_word';
+            if (isMsWordMime) {
+              errorKey = 'error_preview_no_docx';
             } else if (isMsExcelSheet) {
-              errorKey = 'error_preview_not_gsheet_ms_excel';
+              errorKey = 'error_preview_no_xlsx';
             }
 
             appStore.showToast({
               message: appStore.i18n(errorKey),
-              variant: 'negative',
+              variant: 'warning',
             });
 
             return;
diff --git a/test/app/plugins/preview/preview.test.js b/test/app/plugins/preview/preview.test.js
index 000b890a..2514bc27 100644
--- a/test/app/plugins/preview/preview.test.js
+++ b/test/app/plugins/preview/preview.test.js
@@ -194,7 +194,7 @@ describe('Preview plugin', () => {
             edit: {
               status: 200,
               sourceLocation: 'gdrive:driveid',
-              contentType: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+              contentType: 'application/vnd.openxmlformats-officedocument.fooml.document',
             },
           },
         );
@@ -217,8 +217,8 @@ describe('Preview plugin', () => {
       await sidekickTest.clickToastClose();
       expect(closeToastSpy.calledOnce);
       expect(toastSpy.calledOnceWith({
-        message: 'This is a Microsoft Excel document. Please convert it to Google Sheets: File > Save as Google Sheets',
-        variant: 'negative',
+        message: 'Preview generation failed. Must be Google document or spreadsheet.',
+        variant: 'warning',
       }));
     });
 
@@ -253,8 +253,8 @@ describe('Preview plugin', () => {
 
       await waitUntil(() => toastSpy.calledOnce);
       expect(toastSpy.calledOnceWith({
-        message: 'This is a Microsoft Excel document. Please convert it to Google Sheets: File > Save as Google Sheets',
-        variant: 'negative',
+        message: 'This is a Microsoft Word document. Please convert it to Google Docs first.',
+        variant: 'warning',
       }));
     });
 
@@ -289,8 +289,8 @@ describe('Preview plugin', () => {
 
       await waitUntil(() => toastSpy.calledOnce);
       expect(toastSpy.calledOnceWith({
-        message: 'This is a Microsoft Excel document. Please convert it to Google Sheets: File > Save as Google Sheets',
-        variant: 'negative',
+        message: 'This is a Microsoft Excel document. Please convert it to Google Sheets first.',
+        variant: 'warning',
       }));
     });
   });