Rediculously large file

Last night I noticed that the loading time of Opera was oddly long. It kept accessing harddisk for a while, which is unusual. So I checked my harddisk and guess what... This is just weird !! Almost no more space in my harddisk ?! Searching any possible large files in the drive, I found the reason. It's in the folder of Folding@Home: Cracking me!! A text log over 20GB?! The Fahlog-Prev.txt had eaten up all space in my harddisk. Hmm...I wonder why. Normally a text file couldn't grow up to such a huge size. Furthermore, like UD, I've been using Folding@Home for awhile and this never happened before. Surfing on the forum, found that this rarely occured before (and not knowing why. could be some sort of bug). Luckly this huge thing can be deleted without causing any problems. What's in this text file? Who knows. It's nearly impossible to open it with GUI editor coz' of the size. I should be able to open it with command line such as type Fahlog-prev.txt | more or more < Fahlog-prev.txt ...it's been too late when these method came up to my mind as I'd already deleted it. Never mind. I'll try it next time I come accross with it again.