How do you resize the screen resolution of a subtitle?

[FallenAngelII]

My rip of "The Mummy" uses a 512x208 resolution, but all of subs for it uses a 4:3 (or whatever 320x240 and the likes is called) resolution meaning it adds black stripes and shows the subtitles at the bottom.

How do I fix this? Is there a command line I can insert into the .sub/.srt files? >_>' <_<'

I even tried copying single lines into a new .txt file and renaming it .srt. The movie is still resized.

[aldaco12]

The player named BSPlayer can load subtitles, and in the 'preferences' screen you have a [subtitles] submenu. You can change many subtitle issues there.