joustmaster
offcumdun
hmm. doesn't sound right.If they are files that an app on your phone understands, you can open them in the app. (In fact the mail client natively reads a lot of stuff anyway, so you can read word docs for example without having to open anything else.) The file is imported into the app and saved via whatever method the app supports. Cloud drive apps often claim to understand everything so that you can save it to whatever drive it is.
I often get emailed zip files full of all sorts of config files, keys, and binaries that need to be sent elsewhere by several different methods.
Not the sort of file that has any identification to it that links it to any specific app.