The best way of finding file type is to use a search in Windows File Explorer or Mac Finder. Both Microsoft and Apple like to hide thing from their users. Make sure Finder and Explorer are configured to be able to display hidden files and folders. Search from your drive's root like C:\
An accidental mouse click in an application like explorer and finder can move entire folders into hidden areas.
We can't know. You have not provided any system information and well, how are we supposed to know where you saved your files? This is an obscure request, to put it mildly. At best we can guess that your pictures may be in your system's default "My Files"/ "My Documents" or similar folders inside an Adobe folder, but that is as good as it gets...