main-window never shows up when I import desktop-components from a resource-file

[Hedge]

Project description:
My qml-desktop-applications uses the Qt Quick components for Desktop.

I compile all files from the desktop-components into a resource-file (which is embedded in the .exe-file).
The main.qml-file is loaded from the resources like this:

viewer.setSource(QUrl("qrc:/main.qml"));

viewer.setSource(QUrl("qrc:/main.qml"));

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main.qml starts with this line which seems to make trouble:

import "desktop-components/components"

import "desktop-components/components"

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Observed behaviour:

• When I compile and execute the application everything works fine
  
• When I move my application to another directory (or PC), the application's main window never shows up.
  
• When I remove all desktop-components stuff and just define a simple Rectangle in main.qml it works.
  
• When I load the qml-file (and therefore the desktop-components from the file-system instead of the resource-file it works (viewer.setSource(QUrl("main.qml"));
• The problem doesn't occur when building my project for debug
• The problem doesn't occur on OSX

Project file-structure:
MyProject
|- release
| |- MyProject.exe
|
|- desktop-components
| |- components
|
|- main.qml
|
|- qmlapplicationviewer