By default Visual Assist X stores its symbol database in the
following directory tree:
Under Windows 2000 and Windows
XP:
C:\Documents and Settings\<USERNAME> \Local
Settings\Application Data\VisualAssist\
Under Windows
Vista:
C:\Users\<USERNAME>
\AppData\Local\VisualAssist\
If you are using Visual Assist X
1614 and above then you can tell Visual Assist X to use a
different directory by setting the registry key:
HKCU \ Software \ Whole
Tomato \ UserDataDir = "C:\new_path\"
You will need to create this String
value since Visual Assist X does not create it by default.
Visual Assist
X will store the symbol database, history, cache and temporary files in this new
directory tree. Simply delete the key to revert back to the default locations
for the symbol database.
Note you need to close all instances of the IDE
before setting this registry key.
原文：http://www.cnblogs.com/smilesharp/p/4813524.html