It all depends on which bat file you drag your imgfs.bin. If you drag it on Dump_PKG__IMGFS.bat you will get sys and oem folders in IMGFS folder of xidump.
Now i used the imgfs.bin with xidump.
But i don't have the folders OEM and SYS.
The files are all in the imgfs folder. But i don't know what to do now.
If you drag it on Dump_FILES__IMGFS.bat you will only get files/modules not split into oem and sys.
One other thing, if the rom was built having "All packages to one" option checked, you won't be able to convert to sys and oem folders because there are no dsm files in the dumped rom!