Can't import .txt file into filter curves

[Trebor]

… back in 2016, I used a Python application that would convert a source sound EQ spectrum and a reference sound EQ spectrum. The former file was called src.txt and the latter file was called ref.txt. The application worked pretty well. But anyway as of now, I can’t seem to import any .txt file into the filter curve dialog. When I attempt to import a .txt file, I receive a dialog box that says “eq spectrum 1.txt: is not a valid presets file.” …

Possibly your EQ curves have >200 points … Filter Curve plugin EQ curves import export format - #8 by steve
That 200 point limit was introduced >2016 … Filter Curve EQ - Audacity Manual