@rolfk wrote: It's part of the standard File package. When you install that package you get two new palettes actually. ONe with the different Open G extensions for File IO operations and another one for Large File IO.
We are at the moment in the process of rereleasing some of the packages on OpenG. The largefile library has been taken out of the file library and put in its own OpenG Toolkit package. There is a version 1.0 on the servers at the moment (and accessible in OpenG Commander), but that should be updated shortly to version 1.1.