Windows 7, LO 4.1 (same behavior with 3.6 also).
Double clicking an ODS file on the desktop will eventually open, but it takes more than a minute (this is a small file we’re talking about - maybe 12K on disk, about 20 or 30 cells with values).
Opening Calc first, then opening the file is relatively quick (less than one second).
I also tried saving as an XLSX file. Double-clicking the XLSX file is quick (< 1 second).
Has anyone else seen this behavior? Is it something messed up with the extension hangling or something?