Is it even possible to have 100,000 files open in PSPad? 

Try GrepWin. Requires Windows 7 SP1 or later. 

https://tools.stefankueng.com/grepWin.html

It appears it can process all files in a directory. Check docs carefully for how
it can process Polish characters. But in Perl, this is your regexp to use on
each line of every HTML file: 

$s=~s/<.+?>//g;

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PSPad freeware editor https://www.pspad.com

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