Why won't QuickTime Pro 7.0.4 open my MIDI files?

Have QT Pro 7.0.4, OS 10.4.6, Safari 2.0.3 on eMac computer. Downloaded MIDI from Classical Music Archives but file won't open. When try to open it, get message on eMac screen "QT cannot open the file tmcpsolf.mid It is not a file that QT understands (-2048)". I could open MIDI files from any source easily in OS 9.0.4 with QT Pro.
I checked MIME settings in QT preferences, and MIDI is checked as "on".
Also can't open MIDI file in eMac of piano music I saved on floppy disk from my Yamaha digital piano MIDI recorder. Get same message as above.
What can I do to get QT to open and play MIDI? Thank you.
eMac Mac OS X (10.4)

Hello,
Sorry for such a long message, but I want to make sure you have all the correct information. Issue #1 is still unsolved. Issue #2 I solved (see below).
Issue #1: QuickTime Pro 7.0.4 won't open Midi files created by external Midi recorder. QT does not recognize Midi file.
Just to clarify, I have a digital piano without USB, so I can't connect the piano to my new eMac to record my music with a suitable computer based Midi recorder/synthesizer and related program. This is my first attempt at recording Midi on an external, not computer based Midi recorder.
I have never tried to use any Midi recording process with my old iMac, OS 9.0.4, QuickTime 5.x
A few days ago I purchased an old (but new, never been used), Midi recorder which does not have USB but it connects to my piano to record as Midi what I play and save on its built in floppy disk. I use the in and out Midi portals on my piano and Midi recorder to send signals back and forth to the recorder, and play the music back in the piano so I can hear what I just played. That part works fine. The recorder is limited to only one Midi track per file for
recording music.
The floppy is MicroSoft DOS format which I initialized with the recorder before using it per the recorder's manual.
After recording several Midi files in the floppy, I wanted to hear them in my eMac and e-mail them. I assumed the Midi format would be recognized by eMac, regardless of the MicroSoft DOS format of the floppy, and that QuickTime would open them. Isn't .mid a generic extension recognized by Mac and QT as a Midi file?
The eMac displayed the Midi files (.mid) on the desktop (I used Imation SuperDisk external floppy drive to transfer the Midi files to eMac). When I double clicked on these files to open them, I got the message I quoted above in my first posting, that QuickTime did not recognize the Midi file.
Perhaps my recorder has some sort of code it assigns to the Midi it records that the Mac and/or QuickTime can't recognize? Or QT won't recocgnize a one track Midi file?
Do you have any guess as to why QT won't recognize my .mid files?
Issue #2: QT won't open Midi music I download from classicalarchives.com
This issue I solved a few hours ago - see below.
In my old iMac, OS 9.0.4 I would double click and listen to Midi music files at classicalarchives.com or any other url via QuickTime Pro 5.x, no problems.
I also downloaded, saved and opened them with QT 5.x
In new eMac, when I double click the Midi file on web, QT automatically opens usual player window and I can listen to Midi OK.
When I save file as "Source" from the above QT window, it is a Midi file (.mid) which QT will not open on the desktop, I get identical "not recognized" message I get with Midi recorder files.
I found a solution to opening and hearing the downloaded file as follows:
When I save Midi file via QT player window as "QuickTime Movie" (.mov), I can open it with QT and listen to it. So, Issue #2 is solved in order to listen to the Midi I download.
Thank you for your time and trouble. Please advise re Issue #1 before we close this case as "unsolved".
Generosa
eMac Mac OS X (10.4) PowerBook 190 OS 7.5.5

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