How to rename file extension

You may occasionally want to rename the extension of your files. For instance, once I downloaded a “.chm” file – HTML help file, which didn’t have an extension. So, I had to add the extension my self. I made an error by renaming it to a “.pdf” file. Now I wanted to correct it, but the extension is not visible when you try to change it. If something like this has happened to you it is because the windows, is configured to hide the extensions of known file types.

Now lets consider the file “SSHClientHelp” for example. It doesn’t have an extension visible, for the file to work properly it must be a HTML help file, but now it is a PDF file.

To enable the extension, go to tools –--> folder options, click the view tab and uncheck “Hide the extensions of known file types”

Now the extension must be visible, rename as usual.

Windows will ask you to verify your action, click yes. You are done!