Software

Any information or advice?

Select Run & type “C:\Program Files\Microsoft Office\your MS office version\Powerpnt.exe" /safe”, where :your MS office version is the subfolder your Office is installed into. Then load your pptx file and see if it corrects the problem.

Try to ulpoad your file here https://onlinefile.repair/en/powerpoint.html
This service automatically restore the data.

Hello
Follow the below steps, It may help You
#Open Microsoft PowerPoint
# On the File menu, click Open.
#In the Open window, browse the corrupt PPT
#Then click the file once for selecting -> Click the drop-down arrow which is next to Open.
#Then Click Open and Repair.
There is a probability the file will be repaired and opened. But unluckily this method fail if corruption is severe. In such situation, you can try any free tool from SysinfoTools,Aryson or Stellar