Probably this file was also "updated"
It is good idea to change DB config file in PP distribution to pixelpost-default.php or something like that. If someone make just update it won't be a problem with overwrite DB config file.
All new users should read install file in docs and then they will know what to do with this file.
Other solution is to make an "installator" for PP. It can detect if we are making an update or install new photoblog.