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Asked: 2026-05-13T11:36:47+00:00

I’m trying to use Interop to manipulate MS Project 2003 (MPP) files. My problem

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I’m trying to use Interop to manipulate MS Project 2003 (MPP) files.

My problem is that MS Project reports that the files is already opened by another user (me!) and that I can open it only as read-only.

Obviously, I’ve tried to restart studio, then windows (xp) but with no effect.
The file attribute for Readonly is cleared on the file.

Any suggestions for what I might try?!

Thanks,

Anders

Imports Microsoft.Office.Interop.MSProject
…
Dim app As ApplicationClass = New ApplicationClass()
app.Visible = False
Dim success As Boolean = app.FileOpen(fullPath, False)

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1 Answer

  1. Editorial Team

    tow things came to my mind, first see if in your code your opening the file elsewhere.
    second see if there is a process in the background using the file.

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