MacWavelets was a 1990s program for the Macintosh designed to analyze and plot wavelet functions. It does not appear to be supported any more. It was able to load and save data in both ASCII and binary formats.
There are lots of reports of files being identified as "MacWavelets SBIN" documents, with perplexed users not knowing what they are or how to open them; some have turned out to actually be MPEG video (from a VCD), or image files associated with Adobe Camera Raw files.
Files apparently have a .dat extension, which does not assist much in file identification due to its generic nature.