"file.txt.exe - a classic malware ploy".
This is one of many good reasons for everyone (whatever the operating system) to move off the MS default and show all file extensions.
As an aside, I have never had to delve into permissions on my XP NTFS to open a .txt file from any device. That is why I think there is something specific that applies to the posters issue or specific file.
Always pop back and let us know the outcome - thanks