This is a troubleshooting tip that should apply to any scenario in which you notice that your usrvol_sftfs.pkg file keeps growing and growing and you want to figure out why.
Issue: Over time you may notice that the usrvol_sftfs.pkg file keeps growing.
Cause: The application you virtualized is creating and storing data within the user package.
Resolution: The first thing you need to do is figure out which application is creating this excess data. If you're virtualizing a single application then this is easy, but if you're working with a suite of apps then it can be a little more difficult. In a case like this, a good way to identify the offending app is to modify the OSD so that it uses a prelaunch script that opens a CMD prompt window so we can do some checking. There's an example of how to do that here but I also included the script example below:
SCRIPT TIMEOUT="0" TIMING="PRE" EVENT="LAUNCH" WAIT="TRUE" PROTECT="TRUE">