Using NReco.PDF Renderer.dllto create a bitmap from a PDF file fails in Win 7 unless calling program run as admin

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Using NReco PDF Renderer ( v 1.2.2.0) in a C# Winforms app made with Visual Studio 2019 to create a bitmap from a PDF file fails in Win 7 unless calling program run as Admin. Is there a way of using NReco.PdfRenderer.dll so that calling program in Win 7 does not need to run as Admin? This problem does not occur when running the program in Win 10.

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SimonKravis On

Setting the permissions for NReco.PdfRenderer.dll to give the Users group full control removed the problem. The installation (in C:\Programs (x86)\Program Name) only gives the dll Read and Read & execute permissions to the Users group by default. The SYSTEM and Administrators group have full control by default.