The TDR file extension is related to the ArVid (Archiver on Video) a VHS tape backup solution. The *.tdr file stores tape backup.
TDR file extension - ArVid tape backup file
What is tdr file? How to open tdr files?
File type specification:
The TDR file extension is used for files created with a program called ArVid (Archiver on Video), a data backup solution using a VHS tape as a storage media. It was very popular in Russia and former USSR in mid-1990s.
Use of VHS tapes and recording units reduced the cost of data backup and use of VHS tapes eliminates the need of a computer for data copying. An E-180 video tape is able to hold 2 Gb of uncompressed data.
Probably old and no longer supported file format.