I've tried the same, but to no avail. There are several routes you might want to try though. On systems with a command-line: use gzip or zip to compress the file after you've written the data to file. You can dynamically load the appropriate VI on the system you are currently using. (There is no way to do this correctly, as the Windows and Unix system call interfaces are different. Doing this on tha Macintosh is *very* hard, and required intimate knowledge of PPC fot the mac: not something you want to try for yourself).
Another method might be to use a library call to compress your data. zlib is ported to most systems and can do this. I think you can call the functions in zlib directly using the "call library function" function of LV. You may need a wrapper, as some of
the zlib function use non-standard function-types. Requires some reading of the zlib manuals. Let us know if you have any results using this technique.
Maarten