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How to change multiple file extensions in a folder at once using command prompt

In the below example this would rename all the files in the current directory that end with .bmp to .jpg files.

ren *.bmp* *.jpg*

(ren space *.bmp* space *.jpg*)

Example: you have some "bmp" files in a folder called "test" in "D" drive, then you want to change extension of those "bmp" files to "jpg" then open command prompt then type D:\test>ren *.bmp* *.jpg*

*** No need any additional software to change all files extensions in a folder ***

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Customize the logon screen wallpaper, screensaver and other settings using Tweak UI

When you start Windows, you may be presented with the Windows XP welcome screen, which prompts you click your user name to begin, or you may be presented with a Welcome to Windows dialog box that prompts you to press CTRL+ALT+DEL to log on. By default, if you do not press a key for 10 minutes, the Windows logon screen saver (Logon.scr) starts. To change the logon screen saver (instead of using the default logon.scr), you can use TweakUI. Similarly you can change the logon screen wallpaper (seen when you use Classic logon or when pressing CTRL+ALT+DEL twice at the Welcome Screen)
Tweak UI - Direct download Links
TweakUI v2.00 for XP v2.10 for XP SP1 and above

Configure the Screensaver / Wallpaper settings in your profile
Set the Screensaver timeout to preferred value in minutes
Test if the wallpaper / screensaver works fine in your profile
Install Tweak UI and run it. Click Logon, click Settings
Select Screensaver from the list box and choose Copy Now
Select Wallpaper from the list box and choose Copy Now
Restart Windows for the changes to take effect
Manual Registry Edit: You will need to modify the values for the following (at the least):
SCRNSAVE.EXE - Name of the .scr file with full pathScreenSaveActive - Screensaver Timeout valueWallpaper - Full path of the .BMP file
In this registry key:
[HKEY_USERS\.Default\Control Panel\Desktop]