When i extracted with 7zip i had the same error, so i tried the winrar method and it worked.
you must run 7zip (7zFM.exe) under locale emulator, not the game
The filenames can be recovered with
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, however, the the GUI does not offer options to extract with alternative filename encodings so one must use the 7z command-line tool that comes with 7-Zip, e.g.: "C:\Program Files\7-Zip\7z.exe" x -mcp=932 A_Record_of_Delias_War.zip
If you are dead set on using a GUI application to achieve the unarchiving goals, some tools that can accomplish such are:
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(freeware but warning: sometimes packaged with PUA:Win32/Presenoker),
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(freeware with standalone "portable" versions that do not need to be installed to be used, including x64 but I notice it doesn't always preserve dates properly) and
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(popular trialware nagware shareware).
It is improper for the Japanese developers to release zip archives with cp932/Shift_JIS encoded filenames (technically zip archives do not support such), but it really unforgivable when English translators go and do the same thing.
I highly recommend against playing with your locale settings, including using an emulator, since this is an issue with the zip archive and not the game files themselves (RGSS RPG Makers use Unicode APIs).