Symptom: When importing a TopSolid v6 file (.top or .dft) using the Import / Export > Import file with conversion... command, no document is created in the project tree.

Probable cause: The Microsoft Visual C++ 2005 Redistributable x86 and x64 components are not installed.

Solution: Install the The Microsoft Visual C++ 2005 Redistributable x86 and x64 components.
These components can be downloaded from the following site: ftp://ftp.topsolid.com/Public/TopSolid/Drivers/Redist/

As an alternative, you can install a recent version of TopSolid v6.
The download links of the latest versions are available on the following page: https://faq.topsolid.com/?action=faq&cat=1&id=61&artlang=en