When using this trick to extract data from PPTX file I get an error
Unable to expand archive "test.pptx.zip". It is in an unsupported format
How do I extract video from my PPTX then?
Error when “unzipping” powerpoint file using Archive Utility
catalinams office
Related Solutions
Try saving the screenshots to a JPG file and then inserting them into the Powerpoint. You can switch the format that Mac OS saves screenshots in to JPG by typing the following command into a terminal window:
defaults write com.apple.screencapture type jpg;killall SystemUIServer
I just tried it with identical screen shots and saving to a JPG file and then inserting into the Powerpoint made the file 80% smaller than pasting the screen shot directly into the Powerpoint. The quality was identical.
You can shrink your existing files by saving the screenshots out of Powerpoint as a JPG (right click and choose save as picture), then delete it from the slide and re-add it from the JPG you saved.
To switch back to saving screenshots as PNG, use this command:
defaults write com.apple.screencapture type png;killall SystemUIServer
The permissions look okay. Maybe you're not (or are no longer) the owner. Try opening Terminal.app Then type: chown USER ~/Desktop/FILE replacing USER with your username, and FILE with the filename plus the extension, assuming it's on your Desktop. If you've executed the command successfully, it will seem like nothing has happened. If you fail, it will complain, but you're not going to harm anything.
Then try to open it.
Aside from that, I'd maybe you could have encrypted it by mistake?
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Best Answer
The way to do it is to either try different unzip utility, such as 7zip, or use terminal: navigate to the folder with your "test.pptx.zip" and run these commands:
First line creates folder
test_dirand then moves to that folder. Final command unzips your pptx file intotest_dirfolder