TAB files

MapInfo 15.2 introduced extended TAB files allowing you to let TAB files grow beyond 2 GB.

They can be recognized by having the type NATIVEX in the TAB header.

At the same time both classic and extended TAB files started by being created with a default blocksize different from 512 ($0200) which was otherwise the standard.

They are not so easy to recognize, but the size is stored in byte 262-263 ($0106) of the MAP file.

Inside MapInfo you can query tableinfo(tablename,49).

We support all variants when importing networks, but you can only use classic TAB files with blocksize 512 as input for calculations.