Hi, Do I use the ZIP file system correctly? I do the following: -=-=-=- zipFile := FileLocator temp / 'file.zip'. zipFileSystem := (FileSystem zip: zipFile) open. (zipFileSystem root / 'dir1') createDirectory. (zipFileSystem root / 'dir1' / 'file.txt') writeStreamDo: [ :stream | stream << 'Hello World!' ]. zipFileSystem close. zipFile contents. -=-=-=- And zipFileSystem close produces an error. Thanks for any advice. Juraj