Main point is that the 64 bit build needs the 64 bit Tk.

On Nov 3, 2020, at 12:00 PM, pd-dev-request@lists.iem.at wrote:

Message: 1
Date: Tue, 3 Nov 2020 04:43:42 -0300
From: Lucas Cordiviola <lucarda27@hotmail.com>
To: Miller Puckette <msp@ucsd.edu>
Cc: pd-dev <pd-dev@lists.iem.at>
Subject: Re: [PD-dev] [PD] [PD-announce] Pd 0.513 test5 released
Message-ID:
<MWHPR22MB0864B7EAE3380C7412622C01A6110@MWHPR22MB0864.namprd22.prod.outlook.com>

Content-Type: text/plain; charset=utf-8; format=flowed

Hi Miller,

On Windows 64bit builds starting from Pd 0.51.3-test2 you have switched 
tcl/tk-8.6.8(64bit) to 8.6.10(32bit).

Was it intentional to change the arch?

Pdfontloader.dll (64bit) has stopped loading and Pd falls-back to 
courier font.

--------
Dan Wilcox
@danomatika
danomatika.com
robotcowboy.com