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Now that I'm on good internet I queued up all my uninstalled GOG games in the downloader, and it's nearly done, mostly <1GB games to go now. Just to see if stuff was working, I looked in the folder for The Witcher Director's Cut, and it's got 7 files in there. a <1MB exe and 6 .bin files about 1.5GB each. This is the only multi-part game in my queue so I can't check it against others.

I'm assuming each file corresponds simply to the standard HTTP downloads, but should they all be .bins and the .exe 'extracts' each bin to the install?
Just click the .exe file and it will install, the bin files are data containers.
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PoliteTimesplitter: Now that I'm on good internet I queued up all my uninstalled GOG games in the downloader, and it's nearly done, mostly <1GB games to go now. Just to see if stuff was working, I looked in the folder for The Witcher Director's Cut, and it's got 7 files in there. a <1MB exe and 6 .bin files about 1.5GB each. This is the only multi-part game in my queue so I can't check it against others.

I'm assuming each file corresponds simply to the standard HTTP downloads, but should they all be .bins and the .exe 'extracts' each bin to the install?
That's normal behaviour on GOG for large games. The executable which is needed to launch the game's installation, as well as the .bin files that contain the game's files. I suggest that you don't rename them, as renaming can cause trouble for the digital integrity check, which can check whether one of the files is corrupted.
Great, nothing to worry about then. Thank you!
Your assumption is correct, and yes, they should all be .bins except for the small .exe which extracts them all.

It would be nice to have a single .exe file for each game, but on Windows (Vista and onward) the operating system checks the validity of signed executable files, and this takes a long time for huge files so a tiny .exe is better in this regard. Making sure that no file exceeds 1.5GiB is useful because it gives customers more options when backing up or transporting installers - it's possible to fit all the files on a USB stick even if it uses VFAT32 and you don't feel like reformatting, or you could burn it to DVD with 3 parts of the installer per disc.