The file extension .bdt is also implemented in the Lingvo Dictionary, which is one of the more popular software applications found in Russia that features language translator functionality, and over seven million entries.
The BDT extension is used to identify files written in the TAC browser script, the programming language of SWOOT web browsers. TAC script is a proprietary program. With BDT files, users can edit the content, functionality, shape and design of their web browser, allowing for personalization and user-control.