: Projects like CC-CEDICT provide public domain dictionary data often distributed in compressed formats for developers and hobbyists to use in tools like Cidian .
: Kindle and other e-readers often use "StarDict" formatted dictionary files inside .zip archives. These allow for "tap-to-translate" features while reading ebooks. English-Chinese Dictionary.zip
: Platforms like the Internet Archive host digital scans and OCR-processed versions of famous historical dictionaries, such as those by Herbert Allen Giles or Robert Morrison. Notable Dictionaries often included in such Archives : Projects like CC-CEDICT provide public domain dictionary
Depending on where you found the file, it likely falls into one of these categories: English-Chinese Dictionary.zip