# The case of the missing dotXSI.dll (NT) or libdotxsi.so (IRIX)

A customer reported that he couldn’t import or export dotXSI, and that he got this message in the history log:

```# INFO : 4011 - Import/Export .xsi: The dotXSI.dll (NT) or libdotxsi.so (IRIX) is missing or the class is not registered.
```

From past experience I was pretty sure this was a PATH problem, but just in case I also suggested running runonce.bat to make sure everything was registered:

• Check that “C:\Program Files\Common Files\Softimage” is included in your system PATH environment variable.
• In a Softimage command prompt, run runonce.bat, to make sure all DLLs are registered.

It turns out the problem was indeed the PATH environment variable: it was missing C:\Program Files\Common Files\Softimage.

To check the PATH, click Start and open the Control Panel. In the Control Panel window, type “environment” in the Search box, and then click Edit the system environment variables