Apple Macintosh System 7.5 - Manual (Page 57)

Is the TrueType version in System 7.5 the same as the TrueType extension that works
with System 6.0.7?
Yes. However, once you’ve installed System 7.5, you do not need the TrueType
extension and should remove it from your System Folder.
Can I still use Font/DA Mover to install fonts?
No. In System 7.5, you install fonts by dragging them to the System Folder
icon. Beginning with system software version 7.1, they are automatically
placed in the Fonts folder. (In version 7.0, they are placed in the System file.)
Can I use my current fonts with QuickDraw GX ?
You can use Type 1 PostScript fonts with QuickDraw GX, but you must use
the Type 1 Enabler utility program to enable them for QuickDraw GX use.
(See Chapter 3 of the Macintosh System 7.5 Upgrade Guide for details.)
55 Performing the Group Upgrade