Tested with SF V10, 13, 14 and SF Audio Studio V10. Same problem. But SF Audio Studio V12.5 does open the files properly.
Some MP3's produced across the country (by different producers in different locales) for our radio station play just fine with various media players: VLC, Winamp, Win10 Media Player, but they won't open in SF. The thing in common with these files is that no Bitrate parameter is shown (i.e. blank), in Windows File Manager->Properties->Details. (The bitrate, however, is displayed as 128 in Winamp and VLC as the audio is playing). The error msg in SF is "Warning: An error occurred during the current operation. The file could not be opened."
Have others noticed this problem?