Re: Ask the Experts Help

Tech-Archive recommends: Fix windows errors by optimizing your registry

There are a number of other posts on this same error message (including a
couple from me), with no answers. One such thread is here:

http://msdn.microsoft.com/newsgroups/default.aspx?query=certificate&dg=microsoft.public.pocketpc.developer&cat=en-us-msdn-mobile-ppc&lang=en&cr=US&pt=&catlist=9A8119CF-126A-4E25-924D-CF615B37BCE0%2C774F24A2-F71F-425F-AC2B-DC48AB0DA5C9&dglist=&ptlist=&exp=&sloc=en-us

In my case I've narrowed it down to this with some small test apps, not even
having to do with .Net:

- an unmanaged C++ evc4.0 app links with a target 3rd party dll. This dll
is marked hidden/system/read-only/InROM. In my test code I do a simple
"TargetClass x = new TargetClass();" call. I believe it's the act of using
the target dll that triggers the error message. I can instead do just a
LoadLibrary of the dll (but don't actually use it) with no problem. And if I
link with the .lib for the target dll, but again don't actually use it, no
problem.

- If instead I link my test app with my own test dll also written in
unmanaged C++ evc4.0 dll and try to get an instance of an object and call a
test method, no problem. This proves even under WM5 you can still create
runnable apps and dlls with evc4.0, no certicates required, no VS2005
required.

- If I mark my test dll hidden/system/read-only, I can still run my test app
without problems

So it definitely seems more due to the "trusted certificate" issue than the
"component not found" issue.

But I still can't determine:

a) is the target 3rd party dll signed with a certificate? It's never been
signed before, and I don't know what utility would tell me this.

b) if I just sign my test app would it then be able to use the target dll?
Can I just sign it with a test cert? A real cert? Does it have to be the
same cert as the target dll was signed with in order to use it?

c) how can I sign my test app with a test certificate? The online docs for
a desktop use case say I'd need to run the SetReg.exe utility to set some
registry value that makes test certificates be "ok". Is there a similar
utility for WM5 pdas?

I can't believe that EVERY app anybody ever writes for WM5 needs to be
signed with a costly certificate!
--

Tim Johnson
High Point Software, Inc.
www.high-point.com
(503) 312-8625


"Matt" <zimmerma009@xxxxxxxxxxx> wrote in message
news:1131484665.955066.97740@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hello,
>
> I know that some of the MS experts read through these posts and I have
> a question for them. Today I took part in the ask the experts online
> chat. I had an issue where when I attempted to run my applicaiton and
> I would get the following error:
>
> "The file '<file name>' cannot be opened. Either it is not signed
> with a trusted certificate, or one if its components cannot be found.
> You might need to reinstall or restore this file."
>
> Their suggestion was to create another dummy project and copy over the
> "additional files" path from the generated project to my project. This
> was probably a good thing considering this was blank in my migrated
> project.
>
> The problem that I have with this is that it did not fix my problem. I
> was wondering if there was anything else I can do to fix this or
> anything else I should try.
>
> Thanks.
>
> Matt
>


.

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