how to fix cannot register assembly. System cannot find the file specified.

Question

how to fix cannot register assembly. System cannot find the file specified.

John Smith 0

I have the below error and have no idea how to resolve. I am attempting to setup a visual basic application under visual studio 2022 .net 8.0 which will be accessed from excel vba. Greatly appreciate any recommendations on how to resolve. MSB3217 Cannot register assembly "C:\Users\DeskTop-10\Documents\visual studio projects\MetaData_Extractor\MetaData_Extractor\bin\Debug\net8.0-windows10.0.22621.0\MetaData_Extractor.dll". Could not load file or assembly 'System.Runtime, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

Viorel 122.6K Reputation points

2024-04-15T05:29:27.93+00:00

Did you also try to setup an application that is based on .NET Framework instead of .NET 8?
Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2024-04-15T07:24:28.81+00:00

Hello @John Smith,

Welcome to Microsoft Q&A forum.

Perhaps some settings/rules have been changed in .NET/.NET Core and this causes the assembly failed to be registered.

How did you setup it in VS 2022? Did you refer to some documents(guidance)?
John Smith 0 Reputation points

2024-04-15T17:41:14.31+00:00

Application worked with .NET Framework 4.7.2. Under .NET 8 the build only fails when Register for COM interop is selected under Compile>General. Just built new pc and upgrade to windows 11 from windows 10 and installed visual studio 2022 which replaced visual studio 2019. I believe the setup was the same. At this point I just have no idea where to even begin looking.
Viorel 122.6K Reputation points

2024-04-15T18:18:38.27+00:00
Check some aspects:

https://learn.microsoft.com/en-us/dotnet/core/native-interop/expose-components-to-com

However, I think that it is still reasonable to use the .NET Framework instead of .NET.

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Viorel 122.6K Reputation points

2024-04-15T05:29:27.93+00:00

Did you also try to setup an application that is based on .NET Framework instead of .NET 8?
Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2024-04-15T07:24:28.81+00:00

Hello @John Smith,

Welcome to Microsoft Q&A forum.

Perhaps some settings/rules have been changed in .NET/.NET Core and this causes the assembly failed to be registered.

How did you setup it in VS 2022? Did you refer to some documents(guidance)?
John Smith 0 Reputation points

2024-04-15T17:41:14.31+00:00

Application worked with .NET Framework 4.7.2. Under .NET 8 the build only fails when Register for COM interop is selected under Compile>General. Just built new pc and upgrade to windows 11 from windows 10 and installed visual studio 2022 which replaced visual studio 2019. I believe the setup was the same. At this point I just have no idea where to even begin looking.
Viorel 122.6K Reputation points

2024-04-15T18:18:38.27+00:00

Check some aspects:

https://learn.microsoft.com/en-us/dotnet/core/native-interop/expose-components-to-com

However, I think that it is still reasonable to use the .NET Framework instead of .NET.

Answer 1

Tianyu Sun-MSFT 34,436 Microsoft External Staff

Hello @John Smith,

I notice that you mentioned "when Register for COM", not very sure, but is this thread helpful: Registering Assembly fails with error unable to resolve assembly? Perhaps the setup was not the same.

Kind Regards,

Tianyu

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Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2024-04-30T01:51:47.5+00:00

Hello @John Smith,

We have not heard from you for a couple of days. May I know if you have checked the suggestions in the ticket which I shared above, and did it work?

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how to fix cannot register assembly. System cannot find the file specified.

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