|One way to make it a bit easier is to put this into NotePad:|
ren *.hta *.htm
Give it a name and save it as a .bat file (rather than .txt).
You can then copy this into each folder containing hta files and
they will change to htm when you double click it. This assumes
that all the .hta files in the folder "should" be .htm.
Another possibility is to use the fixes on here:
See the HTA fix and the HTM/HTML fix.
Always pop back and let us know the outcome - thanks