Fixed the problem of illegal path when decompressing *.BNK files of HOTD4 (PS3 Japan), Rambo (Arcade), SEGA GoldGun (Arcade) #8
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Illegal path
In the Japanese PS3 version of House of the dead 4（DISC ID:NPJB00198）, SEGA used the path of the DDS texture file as the file name, which caused the bnk extract tool to have an illegal path when pathlib.mkdir
This situation also occurs in the arcade games Rambo and SEGA GoldGun, which are also developed using the SEGA NN engine.
Solution
I added some checking code before the mkdir so that if an illegal file name is detected, the script will treat the drive letter as a folder instead of omitting it, which may help others writing recompression scripts.