gzip

hi guys down loaded a bulk file of movies it came in as a zip i extracted it gave me a gzip of about 78 mb extracted that using gnu zip and winrar it created a file of 75.4 gb but it has no extension can anyone help please

Just to test, try extracting it again with 7-zip.
It might just be a fake file. They exist in rar format too (rar bombs); sometimes are very small, but because it’s repetitive data (which compresses well), it extracts to ridiculously large sizes.