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RC4 File Extension

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Hi Everyone,,,Was just looking at my directory holding my FS2004 flightplans. While there, I noticed there were a number of files w/ a .RC4 file extension. I'm pretty certain they are related to Radar Contact, but could anyone advise re: the purpose of these files. With that, are these files temporary in nature, i.e. are they created each time a RC4 flight is taken? Thanks for the info,orbmis

 Michael Simbro

Intel i7-6700, EVGA GTX 1660ti 6gb, Nvidia 456.71 drivers, Win 10 Pro/64bit

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they are the customizations that you last made, to the .pln by the same namejd

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