Hi Louise
You likely won't find a .HHP file (at least an updated one)
unless you regularly compile a .CHM format. This is the file the
HTML Help Compiler uses. So RoboHelp HTML normally updates it just
prior to compiling.
It seems very odd that you would re-open your project after
working on it just last night and see no changes. Were you by
chance working on it from home? You then transported files to the
office and attempted to resume there? That might be one possible
explanation.
Sorry, but my psychic powers haven't yet developed to the
point where I can tell you where the files you need are located.
I'm afraid we will need more information in order to hazard a
guess. For example, where did you think you had your files? Were
they possibly on a network resource? If so, perhaps there was some
server failure and your IT staff restored from a backup that was
several months old.
Wish I had better answers for you... Rick