The prompt box in outlook is as follows:
"This operation has been canceled due to restrictions in effect on this computer. Please contact your system administrator ."
Solution
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Check the registry key values and change them"Htmlfile", Without quotation marks.
Hkey_classes_root \. htm \ (default)
Hkey_classes_root \. html \ (default)
HKEY_CURRENT_USER \ Software \ Classes \. htm \ (default)
HKEY_CURRENT_USER \ Software \ Classes \. html \ (default)
HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \. htm \ (default)
HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \. html \ (default)
Check the following registry key value and change it"C: \ Program Files \ Internet Explorer \ ipolice.exe"-nohome. It must be case sensitive, with quotation marks.
HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \ htmlfile \ shell \ open \ command
My outlook finally got rid of the problem of being unable to open a hyperlink.
I also found the reason for these registry key values being modified, which is caused by notepad ++.