NEW Outlook (20230421002.10) no longer opens attachments in desktop apps when double-clicking

Dear Peter M610,

Thank you for reaching out to Microsoft Community.

l learn that you're experiencing issue with Outlook attachment.

• May l confirm if there is any error message show up when you try opening the attachment? Kindly request you to provide a screenshot with us for further analysis.
• May l confirm if you have migrated your old settings to the new Outlook for Windows? As you start the new Outlook for Windows for the first time, you'll be asked during set up whether you want to migrate your settings, so your new experience feels familiar.  Please try migrating your classic Outlook for Windows settings again. Select Settings  > View all Outlook settings. Select Managenext to your account and choose Get Started. Please feel free to let us know if any difference after migrating the settings.

At same time, to get accurate information about this query, we recommend you contact support to reach support agent right within the new Outlook for Windows. Go to Help > Support. Provide a description of the problem. You may also attach a video recording or include screenshot to illustrate the problem and select Submit. They will further assist you about your mentioned issue concern.

Your understanding and cooperation are highly appreciated. Thanks for your precious time and have a good day.

Sincerely,

Tammy | Microsoft Community Moderator.

Tammy, thanks for the quick response. I've re-migrated my Classic Outlook settings, but the attachment behavior hasn't changed; i.e. both single-clicking and double-clicking an attachment opens the associated Outlook viewer. See below for screenshots from Step Recorder:

I am also facing the same issue. When I double click the attachment in "New Outlook" (say a PDF file which I received as an attachment), it is opening in the viewer and only after downloading it is opening in the connected app/ program.

Has there been a resolution to this? I also have the same issue when single or double clicking a PDF attachment in an email for example, it only opens in the preview window, not through the desktop PDF app as the full release Outlook does. I have to download the attachment then open it on my desktop for it to use default PDF desktop app.

Delete Edge, run outlook and set your preferred browser and it will stop. Microsoft will more than likely get slapped for this, just will take a while.

They want to force you to use edge.