The test results you have selected are very old and may not represent the current state of Wine.
Selected Test Results (selected in 'Test Results' table below)
Everything tested (save/load *.sbw files, update/display bond values, basic use)
What does not
What was not tested
Anything beyond simple Series EE bond entry/update/display/save. This implies all series will work at least for basic use. Cannot make any claims for more advanced uses.
US Treasury offers some sort of online interface for non-Window$ users, so I don't think this should be a deal-breaker for linux conversion if you are worried about it. I've not tried the online US Treasury interface, however.