Files with .tbm extension are used by TextWorks. TextWorks may not open .tbm files if its version is outdated. Update TextWorks to the latest version to open .tbm files. The latest TextWorks version can open file formats supported by older versions.
TextWorks is an application by Inmagic, Inc. It is commonly used to handle .tbm files. These files fall under Database Files category.
You cannot access .tbm files although TextWorks is installed. Make sure the software is up-to-date. Software creators may add compatibility with newer formats when updating applications. This causes .tbm files to become incompatible with TextWorks.