If you receive the error below, here is how to resolve it.
This means that you need to add the folder of this document to the list of locations trusted by Excel.
Open Excel, go to File>Options then Trust Center>Trusted Center Settings>Trusted Locations then click the Add new location button and select the folder of the document mentioned in the error message. If the location is C:\ProgramData\Exponenciel\... as in the above example, type C:\ProgramData\Exponenciel and make sure the Subfolders checkbox is checked.
Then Click OK. You should be all set.