Problem : After updating to 2.61 from any version of R2, you may get an "Incorrect file structure" error, preventing the scene from loading, if the scene contained an OSM object.
firstly...BACKUP YOUR SCENE !!!
- Update to version 2.69 (or greater)
Rename your scene file, by adding the phrase "DE_RECOVER" (e.g. DE_RECOVER myfile.c4d)
Load the file into C4D
Save the scene with the original name (removing the "DE_RECOVER" phrase ), and it will now open without problems.