Another bug in the File > Open from File dialogue

[rdstern]

Describe the bug
a) I use File Open and then open 6 Excel sheets from the library - in the Instat Experimental file. This is fine
b) I return to the dialogue and now open a single file Chipata1.dly
c) It refuses and the second line shows it has not changed the saving line. It is still trying to save the 6 data frames from the previous command.

Here is the error message:

I can reproduce the problem just from the library data sets. Also also show a second problem!

a) In Open from library use step a above - fine
b) Return to the previous command (Open)
c) Notice the second bug to me anyway. It has remembered the previous sheets, in the Excel file, but Ok is not enabled. Either it shouldn't "remember" the sheets, or the Ok should be enabled. But that is secondary here.
d) Go to library again and choose Climatic > Nigeria and samaru56.csv file. Notice the dialogue hasn't changed, so it doesn't give me the option of a data frame name.
e) Ok gives the error.