Unable to switch to type ramp view after opening a woff font file

[br45entei]

I opened a woff file by double clicking on it, and then clicked on the "switch to type ramp view" button. However, instead of the usual screen with a slider, an error message popped up. I have attached the woff file so that you may test/debug with it. (It's one of Google's free fonts, "Lora Regular", converted from *.ttf) LoraRegular.zip

The parameter is incorrect.

target

OS Version: 10.0.19043.1288 OS Architecture: X64 App Version: 2021.7.4.0 App Culture: en-US

[hyphenminus]

Same problem when viewing non-installed .ttf and .otf fonts:

Character Map UWP reports an error when attempting to switch to Type Ramp view to see variable font features after opening fonts that are not installed.

Error report:

The parameter is incorrect.
target

OS Version: 10.0.19044.1526 OS Architecture: X64 App Version: 2021.7.4.0 App Culture: en-GB

[codeman38]

Same issue here, after opening a TTF that's not installed and clicking the Type Ramp button.

The parameter is incorrect.

target

OS Version: 10.0.19044.1586 OS Architecture: X64 App Version: 2021.7.4.0 App Culture: en-US

[JohnnyWestlake]

Fwiw, finally got around to fixing this, probably won't push the branch for another week or so but the fix is coming! Apologies for taking so long with it

[hyphenminus]

Thanks! In the fix description, does “remove entries not supported by external files” mean that some features (such as Type Ramp, including variable font axes) will not be visible for font files that are not installed? If so, would there instead be a way to access the relevant data to display such features without having to install the font (in the same way that characters and OpenType variations are already viewable without having to install)?

[JohnnyWestlake]

Only adding external files to collections and viewing them in quick compare are disabled, so Type Ramp & Variation Axis should work fine for all of them!

[hyphenminus]

Brilliant, thank you!