how to convert and read old .CWK files on High Sierra
I have a slew of folders containing invoices as .cwk files. I never got around to converting them years ago and now I want to see them. I also have several folders dated earlier (before I understood the purpose of an extension) without an extension of any kind. Obviously this group of files is unreadable - or, is it?
My solution turned out to an easy one: I updated my Text Wrangler application, and used it to open my old .cwk files. Easy peazy. When they open, there is is a slew of unneeded data before and after the invoice information itself: this can be deleted in the usual way, and the file saved as in .cwk, and opened later with Text Wrangler.
As for the files with no extension, they can be renamed with the extension ".cwk" using the "rename files" action in Finder, and you can perform this action for all the files in the folder. Curiously, they are not readable if I rename them as ".pages" or ".doc".
iMac (Retina 5K, 27-inch, Late 2014), iOS 11.4.1