Always back up your game save files before installing new mods. To give you the exact steps, could you tell me: What game or software is this for?
Most "Suit003" files are mods that replace the default "Advanced Suit" or "Classic Suit." Download Suit003
If you are a creator, this is likely a rigged character model. Check Sketchfab or CGTrader . Format: Look for .fbx , .obj , or .blend files. Always back up your game save files before
Run any unknown .exe through VirusTotal before opening. Download Suit003