What is the purpose of each visual basic project file type?

I would please like to know the purpose of each of the following visual basic project file types.
1) FRM
2) BAS
3) FRX
4) OCX
5) CLS
6) VBP
It will also be helpful if you may list the site where i may get this information. thanks

1) FRM - contains all form control's screen design and coding for it
2) BAS - contains common coding/source for entire project
3) FRX - contains the active control's reference if any
4) OCX - is actual ocx control like msflexgrid
5) CLS - class module file contains definiton for the public variables
6) VBP - is visual basic project clubs all frm's,cls,bas, cls etc

1) FRM - contains all form control's screen design and coding for it
2) BAS - contains common coding/source for entire project
3) FRX - contains the active control's reference if any
4) OCX - is actual ocx control like msflexgrid
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