Yes, you can write protect them to prevent them from becoming corrupted. If poser crashes, it tends to corrupt any geometry rsr file it currently has open unless that file is write protected. This most commonly happens with the larger or more complicated figures and props, so for any really polygon heavy model it's a good idea to write protect the rsr while the model is working so that it can't become corrupted later on. You can also just upgrade to Pro Pack or P5, which don't use rsr files. That gets rid of the whole problem and saves you a heap of disk space.

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