Thought I'd post a couple Windows RSA tools here.
A compiled version of Yafu and Msieve tool for factoring RSA Moduli.
YAFU tool
Run the the appropriate Tune File and then either Factor32 or Factor64.bat
A compiled tool that I partially built in VB.net for decoding Base 64 moduli / Primes to Big Integers, Generating XML Encoded RSA Keys and Encrypting / Decrypting. Also has a function built in to randomly check for prime collisions against a moduli (Not likely to ever succeed due to the slowness of generating RSA keys via System.Security.Cryptography and the number of primes existing for larger key lengths. Unless you're really lucky!)
RSA Tools