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I found out that, when I create fields programmatically with rather small internal names, the very first character of that internal name will get encoded.

For example: BN67 becomes %5Fx0042%5FN67 or _x0042_N67. The character B has been encoded. Why does SharePoint do this?

So far, longer field names have not produced similar behavior.

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FYI, that isn't ASCII. 'x0042' is Unicode ( – RJ Cuthbertson Aug 14 '12 at 13:01
Check out this SO post:… Doesn't answer why this happens, but it gives you a method to decode the string for comparisons. – RJ Cuthbertson Aug 14 '12 at 13:53

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