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RockPack III "MSSTDFMT.DLL" error


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Users have reported a DLL error running the Safety Factor Calculations in RockPack III on a Windows 10 64-bit computer:


Class not registered.
You need the following file to be installed on your machine.


This is a DLL which is apparently not installed with newer versions of Windows, and it is required by RockPack III.


We have found that one easy solution to this problem is to install the RockPackIII Plane2Beta Patch.  During the installation of the patch, the missing DLL will be installed.  The installation file for the Patch can be downloaded here:




The patch was originally designed to resolve some known errors in the PLANE failure calculations when metric units are used.  We have found that it also seems to install this missing DLL.


If you run into this problem and the installation of the patch does not resolve this, please contact tech@rockware.com.

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