Show your file extensions
By default Windows hides the file extensions of file types it recognises, instead showing an icon to indicate the type of file. In PsychoPy, and especially when running experiments online, you need to be sure that the file extensions you include in your spreadsheets and Builder files exactly match the ones on your computer.
Here is where you turn on viewing file extensions (and hidden files) in Windows Explorer.
On a Mac the instructions from Show or hide filename extensions on Mac – Apple Support (UK) are:
- In the Finder
on your Mac, choose Finder > Settings, then click Advanced. - Select “Show all filename extensions”.