Change the Default Programs in Control Panel. At the very outset, close Outlook application and turn to Start Menu. Then access to “Control Panel”. In the new popup window, select “Programs” item. In the subsequent screen, you can click on “Default Programs”. Next click “Associate a file type or protocol with a program” link. Quit outlook f it's running. Copy ost/pst data files from current location to you new location. Start outlook, go to File - data file management. Remove all files except that is default. Add all files from new location. Set new default file. Exit outlook. Start outlook, FIle - data file management. Remove old default file. You are gone.

How to change default programs (file associations) to open attachments in Outlook?

Normally when you open an attachment of CSV file in Outlook, it is opening within Microsoft Excel by default. But now you want to open the attachment of CSV file within Notepad, could you figure it out? In this article I will introduce two solutions to change the default programs (or file associations) to open attachments in Outlook.

Change default programs (file associations) to open Outlook attachments by Open with feature

Change default programs (file associations) to open Outlook attachments in Control Pane

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Change default programs (file associations) to open Outlook attachments by Open with feature

If you can find out the same type of files (the CSV file in my example) in your Computer, please follow below steps to change the default programs or file associations about opening specified type of Outlook attachments.

1. Go to the folder containing the specified type of file, right click this type of file, and select Open with > Choose another app (or Choose default program) from the right-clicking menu. See screenshot:

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2. In the opening dialog box, please: (1)Click to select the new program you will open this type of attachments with; (2) Check the Always use this app to open .CSV files option (or Always use the selected program to open this kind of file option); (3) Click the OK button.

3. Now the selected file is opening with the specified program. Please close it without saving.

From now on, all files of the specified type will be opened with the new program by default, including this type of Outlook attachments.

Change default programs (file associations) to open Outlook attachments in Control Pane

You can also associate the specified file type of Outlook attachments to a program in Control Panel to change the default programs of opening specific kind of Outlook attachments.

1. Please open the Default Programs in Control Panel with opening a folder and pasting below path into the address box:
Control PanelAll Control Panel ItemsDefault Programs

2. Now you get into the Default Programs dialog box, please click the Associate a file type or protocol with a program option. See screenshot:

3. In the Set Associations dialog box, please click to select the extension of the specified file type (.csv in my example), and then click the Change program button. See screenshot:

4. Now in the popping up dialog box, please click to select the new program you will open the specified type of files with, and click the OK button. And finally close the Set Association dialog box. See screenshot above:

From now on, all files of the specified file will be opened with the new program by default, including this type of Outlook attachments.

Demo: change default programs (file associations) to open Outlook attachments

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• BCC Warning - show message when you try to reply all if your mail address is in the BCC list; Remind When Missing Attachments, and more remind features..
• Reply (All) With All Attachments in the mail conversation; Reply Many Emails in seconds; Auto Add Greeting when reply; Add Date into subject..
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