Why have batch files stopped working on my system? [closed]

C:Userssscic>h:

H:>cd H:OneDriveBackupsfolder backup

H:OneDriveBackupsfolder backup>folderbackup.bat

H:OneDriveBackupsfolder backup>��
'��' is not recognized as an internal or external command,
operable program or batch file.

H:OneDriveBackupsfolder backup>folderbackup.bat

H:OneDriveBackupsfolder backup>��
'��' is not recognized as an internal or external command,
operable program or batch file.

H:OneDriveBackupsfolder backup>��

folderbackup.bat contains this but even a simple ping will do the same:

DEL /F/Q "H:OneDriveBackupsfolder backupbackups" > NUL