Now after openeing an MPQ

Single: Right click on a File or Folder in the left or right Window to open up the Right-click-menu, to Export Select "Extract..."

Multiple: select Multiple Files and/or Folders in the right Window
(by clicking while holding Shift or Ctrl down, or right-click Select)
now open up the Right-click-menu, Select "Extract..." to Export selected Files and/or Folders

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Now Select where you want to Export your selection

(It's not Recomended that you change the Default settings of this)