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If you are using Microsoft Windows without internet connectivity you wont be able to download VLC player . VLC Player Allows you to rotate videos without the need to re encode it. Here is the Very Basic way to watch any video rotated in any 90, 180, 270 360 Degrees using Microsoft Windows Media Player. Most of the Desktop PC and Laptop comes with Intel Processor and there is Graphics Controller Application installed. You can Check it by right click on desktop and confirm Graphics Options  available. Now Play the video which you want to rotate and play it in full screen if you want. Now Press ALT + CTRL + Down Arrow for 180 Degree Rotation. ALT + CTRL + Up Arrow for 0 Degree Rotation. ALT + CTRL + Right Arrow for 90 Degree Rotation. ALT + CTRL + Left Arrow for 270 Degree Rotation. Thats it.

Video Lan allows you to rotate any video from the video player itself. You dont need to save or encode the video to watch it after rotation. Rotation can be done by selecting the menu Tools -> Preferences (Ctrl + P) then Choose ALL radio Button Video -> Filter -> Transformation Thats it.

You can easily rename the files using command prompt. Command prompt is available with all version of windows. It is easy to write commands and execute (press Enter Key). Change to UpperCase and LowerCase ren *. CSV *. csv To Rename Any Extension to Any Extension ren *.html *.xml