Change percent-sign to anything-else in filename

Change percent-sign to anything-else in filename passed as a parameter.

This started out with "%20" in filenames. I KNOW that 0x20 is the hex code for a space, but I want to know how to change any percent-sign into any standard/printable character(s) so I can analyze the file's contents within TCC or a third-party application. Basically, I want to

change filename
before %in after.png
to
before anything after.png
or
anything.png

within the BTM file, or copy the pre-filename to the...

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