qs?.mb files and lost data

I am trying to determine the logic behind this scenario:

1)  Post a record to a Paradox table.  (No cached updates)
2)  Program crashes 1/2 hour later in unrelated part of program.
3)  Posted record is not in Paradox table.
4)  qs?.mb files are orphaned in Program directory.

I still don't understand the qs?.mb files.  But regardless, isn't a Post a
Post? Why wouldn't the record be put in the .db file and remain there even
if the program later crashes?

Any explanantion would be appreciated.