how and what do you convert the files to use in 3ds max?
Steps:
1. open 3ds max 4.2
2. click on utilities
3. click xrc converter
4. Open XRC file
5. Choose convetation then click convert
6. Now we have converted from XRC to CSM file

Steps to use .csm file
1. Create Biped in 3ds max 4.2
2. On motion capture under motion panel click on "Load motion capture file"(The first icon)
3. Select .CSM file
4. Save it as .bip file in general panel

Steps to edit the animation curve:
1. Select on to Graph Editors menu
2. click on "Track View - Curve Editor"
3. To make it smooth just select the sharp point and delete it, then move the point to make it smoother.

Now we can use .bip in any version of 3ds Max.