In general, there are 3 causes for the issue that recovered files can't open:
There are errors in the path selected for recovered files. In this case, please right-click an individual file and recover it to the root directory of a drive to see whether it can open. If you already closed the program, you can run it again, choose the function you used to scan the drive and load previous scanning results.
Errors occurred during the scan. In this case, please rescan the drive and save an individual file to see whether it can open.
The file got damaged before recovery. Recoverit Data Recovery can only recover lost/deleted files but can't repair damaged files.