.deb installation fails due to other application

[AntiMatterDynamite]

OS: ubuntu 20.04
synergy: v3.0.75.7-rc3

ubuntu dpkg installation fails with the following error:
Error in type 'unknown/unknown' (in /usr/share/mime/packages/musixmatch.xml): Invalid MIME-type 'application/mxm;x-scheme-handler/mxm'.
no other .deb had any issue installing while i had this installed (it's been on my compuiter for years)
i managed to install simply by temporarily moving the file then moving it back after installatioin.

for reference this is the content of the file that caused the problem:

<?xml version="1.0" encoding="utf-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
<mime-type type="application/mxm;x-scheme-handler/mxm">
  <glob pattern="*.mxm"/>
    
  <icon name="x-office-document" />
</mime-type>
</mime-info>

it's of an app called musixmatch which was discontinued on linux.