I am trying to dissemble something to hopefully fix it, however it has some strange screws that I do not have with me preventing me from opening it. What are some things I could do to remove the screws and open the casing without damaging it?
There are a few methods you could attempt to remove the strange screw. Please note, without the proper tool, there is always a risk of damage to the case, screw or tool(s) used for removal. Here are a few methods you could attempt:

1. Attempt to find a suitably fitting screwdriver. For instance, some tri-wing and triangle screws can be opened with a flathead screwdriver, as jamming the flathead against the sides can cause the triangle screw to rotate.
2. Attempt to compensate for the shape of a screw with household items. For example, in the case of a stripped Phillips screw or a Robertson screw, using a rubber band or super glue in conjunction with a Phillips screwdriver can lead to removal with very minimal risk of damage.
3. Drilling out the screw. This method is the most destructive, and while there is risk involved, this could be done with little to no damage to the casing. If done properly, you may be able to separate the head and threads of a screw, leading to the removal of the offending screw without damaging the case.
4. Depending on the situation and desired outcome, it may be best to identify the screw type and acquire a matching screwdriver. With more specific information, I could assist in identifying the type of screw that needs removed.
The screw is completely stripped at this point, how can I properly drill out the screw?