I'm using registered version of 2.3, which I bought today

I have about 1500 html files that I need to replace a string of text in the original with the actual file name. For example:
File name is Cannon.html, this is a example of just one file. All the rest are the same but with different file names.
And the html code within that document goes as follows:
<!applet code="Minus4j.class" codebase="./" width=60% height=60% archive="Minus4j.jar">
<!applet code="Minus4j.class" codebase="./" width=60% height=60% archive="Minus4j.jar">
<applet code="Minus4j.class" codebase="./" width=60% height=60% archive="Minus4j.jar">
<param name="rom" value="plus4.rom">
<param name="prg" value="A_07.prg">
<param name="fps" value="50">
<param name="round" value="255">
</applet>
</p>
I want to do a batch find and replace it to look like the following:
<!applet code="Minus4j.class" codebase="./" width=60% height=60% archive="Minus4j.jar">
<!applet code="Minus4j.class" codebase="./" width=60% height=60% archive="Minus4j.jar">
<applet code="Minus4j.class" codebase="./" width=60% height=60% archive="Minus4j.jar">
<param name="rom" value="plus4.rom">
<param name="prg" value="Cannon.html">
<param name="fps" value="50">
<param name="round" value="255">
</applet>
</p>
I've tried following a few solutions on your forum, but they dont seem to work for me

Thank you so much for this brilliant product.
Regards,
Chris