>Or, what is the proper end string of an WMV?
WMV files don't have a "standard" footer.
Some last bytes from some (3) different wmv files as a proof:
mezdi-glindesdi-14-3-entira.wmv:
Û €–˜
damaun-sonda-12-3-entira.wmv:
DDÇ1C
saira-gievgia-10-3-entira.wmv:
Pÿöí–¸ø¸ø¿h$¿A
secondly, are you experiencing this problem with all your WMVs? and more importantly, what exactly are you doing to them?