I used your previous tip to get rid of the Save/Open prompt when double clicking an attachment. Now I want to undo that for several file types.
How can I undo that?
Undoing this change and re-enable the prompt before opening the attachment is only possible via the Registry.
In general, there are 2 locations which you should check, as where the change is stored depends on the file type and how it was unblocked originally.
Changing “EditFlags” in the Registry
To re-enable the prompt before opening the attachment, you’ll have to modify the “EditFlags” value for the extension in the Registry.
- Open the Registry Editor.
HKEY_CLASSES_ROOT, look for the extension that you want to change. So for a zip-file you locate;
- Note the (Default) value for that hive. For a zip-file this is;
- Now locate that description in the
HKEY_CLASSES_ROOThive. So in our example you locate;
- Here you’ll find a key named
EditFlags. This will either be a REG_BINARY or a REG_DWORD type.
- Double click to open it and change it as follows
Change the 3rd group of 2 digits to
00 00 01 00would then become
00 00 00 00
Change the hexadecimal value of the 4th digit after
0x00210000would then become
Internet Explorer (and some other applications)
If you disabled the “Always ask before opening this type of file” checkbox via another application, such as Internet Explorer, then it could also be that you’ll find a reference to the description value (which you determined in step 3) in the following registry location;
In that case, delete that value from that key or delete the
AttachmentExecute value altogether to reset all the listed extensions to the configured default for your computer.