Perhaps I can help you,
When you download the game.
1. You download Cardwidth
2. You download the Scenario 蟲の姦獄.cab
3. You put the .cab into the Scenario folder inside the Cardwidth folder.
You want to install translations.
1. You extract the .cab file.
2. You copy and paste the translations into folder, overwriting the previous files.
3. You convert everything back into a .cab file and you put it in your Scenario Folder.
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This is a program for extracting and compressing files. It's free, works like winrar cept Winrar doesn't compress into .cab files. Use this to extract, and compress into .cab files.