Open My Computer and click Folder Options on the Tools menu.
Click the View tab.
Disable Hide extensions of known file types by removing the checkmark.
Click OK to exit.
Now you can see what filetypes you're dealing with.
My guess is that they are *.zip archives.
Highlight all the twkdj32* archives and right-click-drag twkdj32a to a space in the same folder (you'll see ghost icons for all the selected files moving).
In the popup context menu, select Extract to ..\twkdj32a\. You can overwrite files if WinRAR asks.
Go to the folder WinRAR just created and you'll see the RAR set and you can then extract them wherever you like.
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