I just figured out the solution to a problem I encountered after migrating to a new computer and O/S. I was unable to open hyperlinks in Excel to folders on the new computer, whereas it works fine on the older O/S (10.13.6) and MS Excel (Mac 2008) application.
History:
At one time Microsoft did not allow space characters (" ") in file names in the path of hyperlinks in Excel files. To get around this, one had to use "%20". Later versions allowed both %20 and " ".
Problem and Solution:
I have a master index file with links to my financial records on my local drive. My older hyperlinks used the %20, but more recent ones had space characters (" ") in the path names. After migrating I discovered that some of the hyperlinks failed and after a bit of debugging noticed the links that failed all had the %20 in lieu of a space character. I edited the hyperlinks, replaced the %20 with a space and everything works again on the new computer.
I still have to put up with the new Microsoft "Potential Security Concern" pop-up, but at least I can get to the folder. I wish I could flag the folder as "trusted" once and subsequently accesses would bypass the security pop-up.
I don't have a Quora or StackExchange account. Feel free to distribute to others, but please remove my personal information.
Jim