Not able to retrieve Creo simulate files

Results files? CAD files? you are going to need to be more specific.

CAD files are backed up into your working folder along with the matrix files and result .rpt file that gets generated when the simulation is run.

Hi do you mind typing or pasting the error message in your next reply ?
And can you confirm you try to open a rwd file from the Home > Open ribbon menu of the Simulate Result window ?