Update the error message in the Files app via Downloads panel.

chrome/app/chromeos_strings.grdp

Index: chrome/app/chromeos_strings.grdp
diff --git a/chrome/app/chromeos_strings.grdp b/chrome/app/chromeos_strings.grdp
index 86279865cea33b857036652fad9a3cd89c569428..9f3571941a02c1f79e34ab9c1a292e43bbbda7cc 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -849,6 +849,12 @@ Press any key to continue exploring.
   <message name="IDS_FILE_BROWSER_ERROR_VIEWING_FILE" desc="Error message when user attempts to open a non-supported file in the Files app via Downloads panel.">
     This file type is not supported. Please visit the Chrome Web Store to find an app that can open this type of file.
   </message>
+  <message name="IDS_FILE_BROWSER_ERROR_VIEWING_FILE_FOR_DMG" desc="Error message when user attempts to open a dmg file in the Files app via Downloads panel.">
+    This file is designed for a computer using Macintosh software. This is not compatible with your device which runs Chrome OS. Please search the Chrome Web Store for a suitable replacement app.
+  </message>
+  <message name="IDS_FILE_BROWSER_ERROR_VIEWING_FILE_FOR_EXECUTABLE" desc="Error message when user attempts to open a exe file in the Files app via Downloads panel.">
+    This file is designed for a PC using Windows software. This is not compatible with your device which runs Chrome OS. Please search the Chrome Web Store for a suitable replacement app.
+  </message>
   <message name="IDS_FILE_BROWSER_ERROR_UNRESOLVABLE_FILE" desc="Error message when the file attempted to open from Downloads panel was not found under paths managed by file manager.">
     This file has wandered off somewhere. Please check your download location setting and try again.
   </message>