Two options:
1. The KRC can write to local files only in the C:\KRC\Roboter\UserFiles directory. You could expose this directory as a network share, working through the Windows side of the KRC4. It's exactly like setting up a network shared folder on any Windows 7 computer
2. The KRC can also mount remote network shares to local drive letters. This requires extra programming, and the creation of a properly hashed password. Once this is carried out, however, the mounted remote share can be accessed exactly as the local file (but with the addition of a path in the filename variable).