From the Admin account, Right click the file you want to protect, select 'Properties', then 'Security', and uncheck the boxes that permit people to modify that file.
...then don't allow people to use the Admin account, cos they could change it back.
------------------------------Which Chip? Well, it depends on which set of thieving b@stardz you choose to support: The ones who use insider trading to enrich themselves while running their company into the ground, or the ones who illegally pay vendors to not support the first group.
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