unzip: fullFileName to: pathString "Unzip the contents of the file specified by the full path name fullFileName to the location given by pathString." so we would expect to pass a string in the second argument? the unique sender of it in the system unzip: fullFileName "Unzip the contents of a gzipped file specified by its full file name to the current working directory" ^ self unzip: fullFileName to: FileSystem disk workingDirectory but the implementation seems to indicate that fullFileName is should be a string as well as pathString unzip: fullFileName to: pathString "Unzip the contents of the file specified by the full path name fullFileName to the location given by pathString." | zipped buffer unzipped newName | newName := fullFileName copyUpToLast: FileSystem disk extensionDelimiter. pathString asFileReference ensureCreateDirectory. unzipped := FileStream newFileNamed: (pathString asFileReference / newName) fullName. unzipped ifNil: [self error: pathString, ' looks incorrect']. [ unzipped binary. zipped := self on: (FileStream readOnlyFileNamed: fullFileName). buffer := ByteArray new: 50000. [zipped atEnd] whileFalse: [unzipped nextPutAll: (zipped nextInto: buffer)]] ensure: [ zipped close. unzipped close]. ^ newName Am I correct to think that the comments are not really good enough? Stef