If I am reading your question correctly, photos are sent to others via email. Doesn't matter what computer operating system you are using. Just have to know where your photos are located and how to attach a photo using your email client.
In Windows 10, most users have photos in C:\Users\(username)\pictures directory. Use File Explorer to find them. From back in the DOS days, I keep everything in a folder I created called C:\data. Photos, downloads, emails, scans, faxes, word, excel, etc. are kept here so they can be easily backed up to DVD or another device without searching all over for files. Back in the day, I think it was CNET created a DOS command that would copy everything from a directory to a diskette and check the date to see if it had been updated. Can't remember the name of it anymore.
If your question deals with something else -- never mind.
Edit -
Oh, and most photos have a .jpg file extension. You can search for that extension in File Explorer to find where your photos are located. Search should be in the right hand side of the directory listing.