skip forward in unfinished WMVs doesn't work

[beholder4096]

Why can't I go forward/back in an unfinished (while downloading) WMV file in BSplayer, when GOM Player does this with no problem?

Is there a problem here with some codec or this really doesn't work in BSplayer? How come it does work in the other player??

how to replicate:
try to download some large wmv file with Opera browser (or make yourself a copy from some WMV file by splitting it with hjsplit File Splitters, freeware and multi-platform: HJSplit ). Then load the file into BSplayer with proper extension (wmv). Skip forward/back doesn't work. Try the same file in in GOM player. File should not be small so you can actually see how it works.

[BSPeter]

I admit I didn't test yet but is "Open locked media files (files in use)" selected under
(rightclick >) Options > Preferences > General [General settings]?
What decoder/filter is used by BSPlayer for such file?
(rightclick >) Options > Filters > Advanced ...