"In previous versions of Help & Manual dashes (-) in topic IDs were converted to underscores in the HTML file names generated from the IDs in HTML-based export formats. This was not necessary, since dashes are actually allowed in HTML file names.
Dashes are now left unchanged when topic IDs are converted to HTML file names. You may need to change calls and links to your output files accordingly when you re-publish old projects with Help & Manual 6 and later."
Since H&M 6+ stopped converting dashes to underscores, we cannot publish in versions 6+ and will have to roll back to 5 indefinitely.
Why? Because we have hundreds of topics and we're not going to go through all of them and update them and destroy the links between them.
Why is it a problem? Because the software we document has a built-in Help reference to the H&M output that won't match up now that all of the dashes aren't being converted. We aren't going through those hundreds of links to update them either.
We are forced to roll back to 5 indefinitely, unless there is some process that will update our topics for us.