This tutorial will help you in adding an image in Desktop and Explorer context menu in Windows XP:

1. First download following ZIP file and extract the DLL file from it:
Download Link
2. Now register the DLL file by giving following command:
regsvr32 DLL_File_Locationi.e., if you saved the DLL file in D:\Image.dll, then give following command:
regsvr32 d:\Image.dll3. That's it. You'll get the image in context menu.
4. To remove the image simply un-register the DLL file by giving following command:
regsvr32 DLL_File_Location /uNOTE: If you want to change the image, edit the file using Resource Hacker and change the image in the file. You can add any BMP file (max size 96x96).
PS: I got this DLL file in some magazine CD, if anyone knows the person behind this DLL file, please let me know and I'll provide proper credits to him.