Unable to open aup file-Windows

I have saved files and when I go back to open them, they are in the directory but do not open.

Any advice would be helpful.

When you “Save” an Audacity project, it will save a project file (.aup) and a folder containing the audio data (_data, containing a number of *.au files). This is not the same as “Exporting”. To save as a normal .wav or .mp3 file you use the “Export” command from he File menu.

More information about “Save” and “Export” can be found here:
http://vip.chowo.co.uk/wp-content/uploads/jaws/Audacity-1.3.3-Guide.html