If you’ve spent any time building large Thinapp packages then perhaps you’ve run into the problem of running out of hard drive space on the C: partition.  For me it was when I was trying to build an Office 2007 SP2 package on Windows XP SP3 and the template I used had only 8GB of local disk space.  First I added a new virtual disk to the virtual machine and did my builds on that drive but I was still running out of space on the C: drive.  After a minute of looking I found this folder C:Documents and SettingsAdministratorLocal SettingsApplication DataThinstallBuildCache.  I first tried a couple of VMware articles that said you could change the location of this cache by using environment variables, which I did but did not have any effect.  I then found a forum post that said this buildcache could not be moved: http://communities.vmware.com/message/1224058

After a couple minutes of thought I said the heck with this and created a mount path to my newly added drive and now my package is off to the races.  In case you don’t know how to do a mountpath on Windows here’s a link: http://support.microsoft.com/kb/307889

In the future, I would recommend making VERY large c: partitions for your Windows XP VMware Thinapp build VM’s or be ready for lots of failures.