Welcome to D2Mods.org, a site about Diablo II Mods and Reviews. I am still building it, dealing with school, medical issues, etc. so the site is under construction. For the time being, I hope you find this little modding tool useful created by Hash Borgir.
Enter the NoDrop chance and Probabilities for however many items you want. Based on what you input in TreasureClassEx.txt, this will calculate the drop chance. You can use this tool to find out what values to put into TreasureClassEx.txt to get a certain item to drop at a certain desired % drop rate