Hi, Tanja,
In that environment, the problem must be a rights issue. All Adagio modules refer to that one file and it is the only one installed on the system. If all of your other users can run Adagio without receiving the error, you need to determine what the difference is between the user that can't run Adagio and the users that can.
You might also want to run ChkSys (located in the Softrak\System folder) while this user is logged on through remote desktop. There is a Check R/W Status button that can be used to determine the user's access to the common Adagio Folders. It's important that you are logged onto the workstation as the Windows user that would be running Adagio when you run ChkSys.
If their rights to the folder are okay, there must be something else that is different with the individual user than the others.
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Regards,
Softrak Tech Support