Upgrade has deleted all my custom rollsign files

My fictional route has some rollsigns, with their own filenames completely separate to the others in the game.

The upgrade to 1.01 has just deleted all of them, which has unsurprisingly made me rather annoyed.

Sorry for that! That's not intended, of course! But why haven't you made a backup of your custom files before installing the update?

I naively assumed you wouldn't delete the entire folder, as an upgrade would have no reason to touch those files. No other upgrade on anything else has ever done something quite so unexpected. So my fault entirely of course.