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">
<SCRIPTBODY>%systemroot%system32cmd.exe</SCRIPTBODY>
</SCRIPT>

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