No, you can't open the cached format with software. It should be that bilibili added a decoder to protect the copyright of the video and the rights of the original author, and it can only be opened in bilibili through the corresponding decoding method.

However, it's not impossible to save it. You can use the screen recording software, play it once and record it. . .

However, this is not good ~ Many videos of bilibili were edited by up from many movies and TV series, which took a lot of time and energy.