It's going's to be hard to report to your 'friend', since:
1) anyone can be that 'friend'.
2) you can't prove how that 'friend' gave you that file.
3) you could've edit it.
Not to be bias against you or your 'friend;, but the above issues exists..
edit:
- You could screenshot any file transactions between you and your 'friend' if it's transfered via messengers/email.
- Upload the data file to here so GM (or other experts) can inspect this.
- Delete stuffs that your 'friend' gave you and ,if possible, clean out your RO folder and reinstall RO.