FEZ Repacker dosen't open Vita font files
Relevant fonts are in this file:
https://mega.nz/file/iFQGBLpT#ArKiiG6xye0PdraydoySekmTB4QpGBa_qHrcKzchHg8
After some researching, it seems to me it's likely from a version of FEZ that uses D3D; according to https://learn.microsoft.com/en-us/windows/win32/direct3d9/d3dformat the value of 80 means D3DFMT_D16 which "indicates a 16-bit integer value and an application-lockable surface."
Note the latest version of FEZ (at least for PC) uses FNA, which appears to not currently support that format.
At some point I might look into converting assets from other platforms, but for now it's not a priority. If texture format is publicly documented, I don't think that will be a problem.