After ordinary operation on deletion of unnecessary files realizing that deleted files are still necessary doesn’t worth panic. Deleted files might be retrievable. The means are different. The most simple situation is when the files can be simply copied from the recycle bin or got back by means of the operating system. The situation is more complicated when the files have been deleted by emptying or bypassing the recycle bin (pressing Shift-Delete,
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using command line or applications that delete files without recycle bin). In these cases files are no longer accessible from the operating system, in case when they are not overwritten they might be recovered by means of a specialized data recovery software.
Note: For successful recovery never write anything to the disk that contains the files you want to recover. Otherwise, the files will be overwritten that causes permanent data loss.