The first time Revit runs on your computer, the user profile folder is created, and then the UserDataCache files are copied into it.

USERPROFILE location:

• Windows XP:

  "%USERPROFILE%\Application Data\Autodesk\Revit\<product name and release>"

• Windows Vista or Windows 7:

  "%USERPROFILE%\Application Data\Autodesk\Revit\<product name and release>"

UserDataCache files:

• OmniClassTaxonomy.txt
• Revit.ini
• shxfontmap.txt
• UniformatClassifications.txt