A: Extracting assets from products you do not own is a violation of IMVU's Terms of Service and constitutes intellectual property theft. Using it on your own work is generally safe but may still be against the letter of the rules.
Dedicated, lightweight programs built by third-party developers specifically for opening IMVU files. imvu chkn extractor
Avoid any tool that requires you to input your IMVU account password to extract a file. Legitimate local file extraction never requires account credentials. A: Extracting assets from products you do not