I have tried to use the new OM 4.0 feature.

Downloaded https://musescore.com/user/10919536/scores/2377386.

Download format chosen musicXML.

Renamed it to G_Minor_Bach.xml

See attachment.

Moved it to workspace folder.

Then tried

(setf import (musicxml-to-omn (workspace-file "G_Minor_Bach.xml")

:inst 1))

which failed

Break.

1 (continue) Return from break.

2 (abort) Return to debug level 1.

3 Return to top loop level 0.

Type :b for backtrace or :c <option number> to proceed.

Type :bug-form "<subject>" for a bug report template or :? for other options.

OM 147 : 2 >

<<automatic abort>>

OM 147 > musicxml-to-omn :inst 1

Error: External format (:utf-8 :eol-style :lf) got error reading #<stream::ef-file-stream /Users/cliffscherer/Music/Ableton/Projects/2025-06_10 Project/2025-06_10/G_Minor_Bach.xml> (file-position 10): continuation byte 185 found at the start of a sequence.

1 (abort) Return to top loop level 0.

Type :b for backtrace or :c <option number> to proceed.

Type :bug-form "<subject>" for a bug report template or :? for other options.

Anything I can do to make it work ?

G_Minor_Bach.xml

No issue with musicxml-to-omn

This file is poorly written and contains numerous errors.

It is good practice to check the file with programs like MuseScore. In some cases, the app can open poorly written files.

If this happens, you can export the file again; however, this was not possible with this particular file.

Alternatively, if the file does not open in the Opusmodus musicxml display, it means the file contains errors.

Before attempting to import the file to Score or OMN events, check if the file opens in our display.

Thank you @opmo . Will follow best-practice. Interesting that musescore.com renders musicxml with corrupted format.

[Edit: wrong conclusion, see last post in thread].

@Cliff did you do happen to do something to the file? The one attached to your post is also corrupted for me, but the one I downloaded from the MuseScore link open fine in both Opusmodus and Muse

@Jorgalad thanks for your effort to reproduce.

I tried it again one more time. The original download in .mxl works as you said. Good!

Once I rename the .mxl it to .xml (as I wrote in original post) it now longer works.

I am on Mac. The seems to happen more than just renaming when changing the extension.

OK, sorry the fuzz @opmo & @Jorgalad .

Note to Mac-users, just keep extension as-is.