I have just encrypted a folder using EFS but recently I am not able to open any files. Error code example in Excel 2007: “you attempt to open the file in a format dissimilar from that in the file extension” Error code for PDF's: Error: Invalid file format does not, the source format is PDF Could it be for the reason that the many files and folders was not all encrypted? The "File attributes" have been recognized all over encryption for all files and subfolders.
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