To change a file extension in Windows, you need to do the following:
1. Open My Computer or Windows Explorer.
2. Locate the file you want to change the file extension for and right-click on it.
3. Choose “Rename” from the popup menu.
4. Type the new file extension after the file name (i.e. myfile.txt would become myfile.doc).
5. Click the “Yes” button to confirm that you want to change the file extension.
Note that if the new file extension is not supported by your operating system, you will get an error message when you try to open the file. This means that you cannot use this extension unless you install an appropriate application to support it.
You can find file extensions associated with different applications in the Registry Editor, which can be accessed through Start > Run.
It is important to note that changing the file extension may not necessarily make the file compatible with other software programs, as the file format may still be incompatible. For example, if you change a Microsoft Word document file extension to .jpg, it will not work as a picture file.
It is also important to remember that changing the file extension does not change the actual file type, so you should be careful when changing file extensions. If you are unsure about what type of file a particular file is, you can use a program such as TrIDNet to identify it.
If you want to change a file extension in Windows 2000, you can use the File Manager program to do so. To do this, open the File Manager and locate the file. Then right-click on the file and choose Properties. Under the File Type tab, select the dropdown and choose the new file extension from the list. Finally, click OK to save the changes.
It is important to be careful when changing file extensions as incorrectly changing the file extension can cause the file to become unreadable. Therefore, it is always a good idea to back up your files before attempting any changes.