mysql_fix_extensions converts the extensions for MyISAM (or ISAM)
table files to their canonical forms. It looks for files with
extensions matching any lettercase variant of .frm, .myd, .myi,
.isd, and .ism and renames them to have extensions of .frm, .MYD,
.MYI, .ISD, and .ISM, respectively. This can be useful after
transferring the files from a system with case-insensitive file
names (such as Windows) to a system with case-sensitive file
Invoke mysql_fix_extensions like this, where data_dir is the path
name to the MySQL data directory.
shell> mysql_fix_extensions data_dir
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MariaDB 10.8 15 May 2020 MARIADB-FIX-EXTENSI(1)