在R中保存工作空间的问题。

I'm new to R but am slowing getting the hang of the basics. However I'm struggling to save and then open my work. I am saving as an .RData file however the file appearis in Windows Explorer simple as a 'File'. When trying to load a workspace into R these files only show when I change 'Files of type' from '.RData' to 'All files' and it will refuse to open these files. What am I doing wrong?I'm new to R but am slowing getting the hang of