| APPX applications routinely create temporary disk files. Temporary disk files include files explicitely created by an application as well as files automatically created by APPX while processing a query. When an APPX application needs to create temporary disk files, APPX creates those files in a special directory. The directory where APPX creates temporary disk files is:
$APPXPATH/aaa/Tmpdata
where:
$APPXPATH is the standard APPXPATH directory
aaa is the Application ID of the application that is creating a temp file
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FAQ's - APPX Software, Inc. : 
How do I upgrade APPX 3.5 or 4.0 to version 4.1?