You double-click the deck, the splash screen shows for a second, then the window disappears. No error dialog, no “PowerPoint has stopped working”, nothing in the title bar. Sometimes it happens with one file, sometimes with every file you open. The useful question is whether the program is closing itself or dying while it renders this deck. Those look identical and need different fixes. ...
A workbook that will not open usually fails in one of three ways: Excel reports the file format is wrong, it offers to repair and then repairs nothing, or it opens to a blank or partially empty sheet. Each has a different cause and a different first move. Try these in order. The order matters — step 6 is destructive, and steps 1 to 5 are not. ...
“Word experienced an error trying to open the file” is not one problem. It is a symptom with a short list of causes, and the cause decides which recovery method works. The good news: for .docx, the text almost always survives. The structure around it is what breaks. ...
The loop looks like this: you open the deck, PowerPoint says it found a problem and offers to repair, the repair “succeeds”, you save, and the next open asks again. Nothing is being repaired, because PowerPoint is fixing the symptom each time and writing the same broken part back into the file. ...
You open a workbook and get: We found a problem with some content in ‘report.xlsx’. Do you want us to try to recover as much as we can? Click Yes, and Excel “recovers” the file — usually by deleting something. Click No, and nothing opens. Either way you do not learn what was wrong. This message is different from the generic “file is corrupt” dialog. It means the package is structurally valid and one part failed validation. That is a much better situation, and it is diagnosable. ...