A corrupt file is one that is different to one or more of the sources it was downloaded from. i.e. the file downloaded has one or more bytes that are not the same as the source.

LimeWire does not check for viruses - you should provide your own virus checking facilities.

A small amount of corruption in audio and video (particularly streaming audio and video) stands a very good chance of not being noticeable.

In executable code and compressed files, corruption is frequently fatal - the corrupted file often can't be used - and great care should be taken if it is used.

Mark