Whenever you want to edit your design again, just head back to Photoshop and the File dropdown menu. From there, select Open and search for the PSD in question. Double-click on the file, and it will automatically open in Photoshop, all ready for editing.
IrfanView\n\n You can use it to open and view PSD file. You can't edit any of the layers in the PSD file, but you are able to convert the image to other formats. It is only available on Windows.