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Hi, I can't get my head around this issue. Let me lay out the scene: My application logs data in a .csv file. The file is created with R/W permissions through the "Open/Replace/Create File" VI. Then it uses the "Write to Binary File" to log the data, keeps the reference opened all along, and only close the file at the end. So far everything works perfectly. If I double click on the file in Windows Explorer, Excel sees that the file is being opened in LabVIEW and shows the typical message giving me the following choice: Read-only, Notify, or Cancel. If I cancel, Excel closes and things keep on going fine. However, if I do click "Read only", the "Write to Binary File" function in my LabVIEW application throws an error 8: File permission error. Somehow opening the file as read-only in Excel steals the write permission of LabVIEW. Have you ever experienced this? What could be happening? Emmanuel