Need help with UNIX command

I need to convert requiem.dat so it can be used with Linux. I've tried using these commands: tr -d ' ' < file₁ > file2 and dos2unix file₁ , but I keep getting this error: /home/username/UnixCourse/sftpAsst/requiem.dat is a text file with Windows-style line termination.

It is not yet ready for use in Linux. at (eval 1) line 29.

Use sftp via the server cs252ft.cs.odu.edu¹ to download the file /var/opt/cs252/mozart.zip) to your PC. Unpack it and examine the files inside. You should find that you have a mixture of text and binary files. These were all prepared on a Windows PC and follow Windows encoding conventions.

Use sftp, again via the cs252ft.cs.odu.edu server to upload those files from inside the zip archive from your PC to the directory you created in step 1. Any text files should be converted, if necessary, to Unix encoding conventions.

requiem.dat is the file that needs to be converted.