Quick Look is an excellent feature that was introduced by Apple in Mac OS X 10.5, used for quickly viewing (i.e.: previewing) the content of many types of files. This way, user only needs to select a file/folder -> then click space bar to quickly browse its content without opening this file/folder or running its associated program first. Its simplicity and efficiency are recognized and appreciated by many Mac computer users. However, Windows OS does not have and will not add this feature. Fortunately, we can use some third-party applications to accomplish the same function.

Directory Opus (DOpus for short) is a superexcellent Windows Explorer alternative with a long development history, written by Jonathan Potter from Australia, and originally developed for Amiga computer system in 1990. Its development time is far ahead of all other similar software, such as: XYplorer, Xplorer2, Total Commander, which also laid its leading position in the field of Windows Explorer/File Explorer alternatives.

The causes of loss of data are nothing else than the following several common ones: accidentally deleted files/folders; formatted some partition or the entire hard drive (which often happens during the reinstallation of OS); due to wrong operations (unexpected or forcible shutdown, direct or forced pullout, etc.), the invalid partition table error occurred in hard disk, USB flash drive, SD Card and other storage devices, so that they couldn't be identified or just identified as RAW format.