unfortunately, this doesn't work: gunzip says "not in gzip format". the size of the file is within less than 0.1 percent of the original .xls file, which leads me to think that it's in that format (or close to it). but neither gnumeric nor ooffice can read it (unsupported format, general i/o error, etc.). what is the .gsf-save-?????? format, anyway?
Oh, you were saving as .xls. I thought you saved as .gnumeric. The .gsf-* files are just temporary files that become the final saved files on success, so yours would be in (truncated) .xls format. Morten