Version 1.20 was released with a nice new option. If you put -auto as parameter one (OneLine -auto), it will automatically copy from the clipboard, process the file, copy back to the clipboard and then exit.  I find that's what I most use the program for, so this makes it very nice to use.  If you unzipped everything in same directory,  I've made a "Auto OneLine" link that you can just click on.  There's no way to specify  the input/output file. If anyone really wants this, let me know, it's not that hard to do. 

Version 1.10.  This was a minor modification that resulted in a huge performance increase.

Version 1.02, a minor update, was released.  The only thing changed in this was a performance modification - OneLine will now not display the compressed file until after compressing it.