On Unix/Linux systems there is command called unix2dos which can convert LF text files to CRLF text files. Otherwise the same is possible with sed, awk, perl, etc.

Also most ftp servers can convert uncompressed text files from LF format to CRLF format on the fly by using ASCII transfer instead of binary transfer. So if you are already using ftp to transfer the files on a local area network this could be an option.