flexpro.tlb not loaded

I’ve successfully linked and used the full api. However, when opening the LabVIEW application again the tlb needs to be relinked. Is there a way to register the tlb?

Using regasm.exe gives the following error:

C:WindowsMicrosoft.NETFrameworkv4.0.30319>regasm.exe “C:Program FilesWeisangFlexPro 12flexpro.tlb”

Microsoft .NET Framework Assembly Registration Utility version 4.8.3752.0

for Microsoft .NET Framework version 4.8.3752.0

Copyright (C) Microsoft Corporation.  All rights reserved.

RegAsm : error RA0000 : Failed to load ‘C:Program FilesWeisangFlexPro 12flexpro.tlb’ because it is not a valid .NET assembly

The cmd prompt was run in admin mode.

Suggestions are appreciated.