10
DVDRip file handling?
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Not the person who replied to you, but no, I don't think you did explain it well since you just have one small subsentence saying ”all as one file", which could mean other things.
To your problem, to my knowledge I don't think this is possible if your movie is fragmented into various chapter files, to watch it as one. If you had them split as a CD1/CD2 sort of situation, that would work but its also not super neatly done.
My question to you, is this on Windows or Linux? Because on Linux, if you are not afraid of using the commandline, there are some CLI tools that can remerge videos for you, e.g. something like this https://askubuntu.com/questions/637074/how-to-merge-multiple-more-than-two-videos-on-ubuntu#831883
Seeing this is run on CLI you can read up how to make a script out of it and automate the process, run it over your whole library. Will take a while and maybe you haven't done this before, not sure.