Inventor drawing only lets me view cant make changes

[LearKit]

I have recently had Inventor installed and replaced my Autocad 14 .

I can open my drawings but will not let me make any changes it is like a read only or view file

Do i need to convert  my old  autocad files to a diferent format ?

[cbenner]

Inventor is a solid modeling program, it was not really meant to directly replace Autocad, which is generally a 2D drafting system.  It looks like you can insert and edit attributes of blocks that are already defined in the drawing in Autocad,... but can't really do much more with them.