Windows 7, 64 bit, DLL problems

Question

This problem is related to missing the Visual Studio "redistributable package." It is not obvious which one is missing based on the dependency walk, but I would try the one that corresponds with your compiler version first and see if things run properly:

Visual Studio 2015

Visual Studio 2013

Visual Studio 2010

Visual Studio 2008

I ran into this problem because I am using the Visual Studio compilers, but not the full Visual Studio environment.

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Going to dare to inject a new link here: The latest supported Visual C++ downloads. Stein Åsmul, 29.11.2018.

I just resolved the same problem with C++ Qt 5 and Windows 7 64 bits with MSCVC 2012.

In the beginning I thought it was a MSVC/Windows DLL file problem, but as BorisP said, the problem was in my project dependencies. The key is "How to know your project dependencies in Qt 5?".

As I didn't find any clear way to know it (Dependency Walker didn't help me a lot...), I followed next the "inverse procedure" that takes no more than 5 minutes and avoid a lot of headaches with DLL file dependencies:

1. Compile your project and take the executable file to an empty folder: myproject.exe
2. Try to execute it, It will retrieve an error (missing DLL files...).
3. Now, copy all the DLL files from Qt (in my case they were in C:\Qt\Qt5.1.1\5.1.1\msvc2012_64_opengl\bin) to this folder.
4. Try to execute again, it will probably works fine.
5. Start to delete progressively and try every time your executable still works, trying to leave the minimum necessary DLL files.

When you have all the DLL files in the same folder it is easier to find which of them are not valid (XML, WebKit, ... whatever..), and consequently this method doesn't take more than five minutes.

I just resolved the same problem.

Dependency Walker is misleading in this case and caused me to lose time. So, the list of "missing" DLL files from the first post is not helpful, and you can probably ignore it.

The solution is to find which references your project is calling and check if they are really installed on the server.

@Ben Brammer, it is not important which three .ocx files are missing, because they are missing only for Leo T Abraham's project. Your project probably calls other DLL files.

In my case, it was not three .ocx files, but missing MySQL connector DLL file. After installing of MySQL Connector for .NET on server, the problem disappeared.

So, in short, the solution is: check if all your project references are there.

As mentioned, DCOMP is part of the VC++ redistributables (implementing the OpenMP runtime) and is the only truly missing component. All the rest are false reports.

Specifically API-MS-WIN-XXXX.DLL are API-sets - essentially, an extra level of call indirection introduced gradually since Windows 7. Dependency Walker development seemingly halted long before that, and it can't handle API sets properly.

So there is nothing to worry about there. You're not missing anything more.

A better alternative to find the truly needed DLL files that are missing (if that is indeed the problem) is to run Process Monitor and step backwards from the failure, searching for sequences of failed probes for a specific DLL file in all the system path.

I also ran into this problem, but the solution that seems to be a common thread here, and I saw elsewhere on the web, is "[re]install the redistributable package". However, for me that does not work, as the problem arose when running the installer for our product (which installs the redistributable package) to test our shiny new Visual Studio 2015 builds.

The issue came up because the DLL files listed are not located in the Visual Studio install path (for example, C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\redist) and thus had not been added to the install. These api-ms-win-* dlls get installed to a Windows 10 SDK install path as part of the Visual Studio 2015 install (e.g. C:\Program Files (x86)\Windows Kits\10\Redist).

Installing on Windows 10 worked fine, but installing on Windows 7 required adding these DLL files to our product install. For more information, see Update for Universal C Runtime in Windows which describes the addition of these dependencies caused by Visual Studio 2015 and provides downloads for various Windows platforms; also see Introducing the Universal CRT which describes the redesign of the CRT libraries. Of particular interest is item 6 under the section titled Distributing Software that uses the Universal CRT:

Updated September 11, 2015: App-local deployment of the Universal CRT is supported. To obtain the binaries for app-local deployment, install the Windows Software Development Kit (SDK) for Windows 10. The binaries will be installed to C:\Program Files (x86)\Windows Kits\10\Redist\ucrt. You will need to copy all of the DLLs with your app (note that the set of DLL files are necessary is different on different versions of Windows, so you must include all of the DLL files in order for your program to run on all supported versions of Windows).

This contribution does not really answer the initial question, but taking into account the hit-rate of this thread I assume that there are quite a few people dealing with the problem that API-MS-WIN-CORE- libraries cannot be found.

I was able to solve a problem where my application refused to start with the error message that API-MS-WIN-CORE-WINRT-STRING-L1-1-0.DLL is not found by simply updating Visual Studio.

I don't think that my build environment (Windows 7 Pro SP1, Visual Studio Ultimate 2012) was messed up completely, it worked fine for most of my projects. But under some very specific circumstances I got the error message (see below).

After updating Visual Studio 11 from the initial CD-Version (I forgot to look up the version number) to version 11.0.61030.00 Update 4 also the broken project was running again.

This solved the issue for me:

Uninstall the Visual Studio 2010 redistributable package if you have it installed already, and then install Microsoft Windows 7 SDK.