How do I convert a .txt file to a .dat file type on Mac OSX?

I need to save as or convert a .txt file into a .dat file format.  I received a .txt file with some license activation code for a client software app.  That app requires the file to be in .dat format.  Mac OS will not let me remove the .txt extension when I rename the file x.dat (instead of x.txt).
ktrahanoAsked:
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ktrahanoAuthor Commented:
Yes, I tried that. It did allow me to save it without the .txt extension, but the other program still did not recognize it as a "dat" file type. The MacOS was still classifying it as an rtf file, even with the .dat suffix.  I had to download a copy of the native / original .dat file to make it work.
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JoshuaOrrCommented:
have you gone into the Get Info section (by right-clicking on it) and checked whether it is locked, or tried removing the extension there and renaming it?

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