I'm running Rx64 3.01 on Windows 7 and until the other day I could easily unzip zip files with unzip (package utils 3.01). Since yesterday however I get an error. Let's say my zipfile file path is called zfile (I'm omitting the output directory for this example). When I try to unzip it I get the following message (I also got the same message with Rx64 3.00 on which the following code has always worked). >unzip(zfile)Warning message:In unzip(zfile) : error -1 in extracting from zip file The zip files are absolutely fine, there's nothing wrong with them (I can open them and browse them, and once I've extracted the R code within them they run on R). I've cleaned the workspace,re-started R several times, created empty and fake zip files, attempted the same thing on different files and directories. searched for previous posts but got nowhere. The strangest thing is that the code above worked until just the other day and now it doesn't. I think I might have updated all packages, so maybe that's what caused the issue. Has this happened to anyone else and have you found a solution? Apologies if I can't give any more code but this seems to have very little to do with the code and more with R/Windows 7. Many thanks M [[alternative HTML version deleted]]