Creo ModelCHECK > config_init_options > DIR_MC_PREVIEW
  
DIR_MC_PREVIEW
<directory path>
Specifies the path to a directory in which the temporary files created by the preview process are stored. The default path is c:\Temp (Windows NT) or /tmp (UNIX).
 
* This option is used only if the DIR_MC_PREVIEW_NT or DIR_MC_PREVIEW_U configuration options are not set. If none of the options are set, the directory from which Creo Parametric was started is used by default.