Change of file type

I have a fair amount of picture files either stored as TIFF or JPEG in various subfolders. Since I upgraded to Tiger 10.4.3 (I believe but am not sure, anyway since recently) some of the files appear randomly in Finder as a "Unix executable file". Note that these false false types appear among other picture file with the correct file type!
I have, for other reasons, repaired permissions but do not see a reason why this would change a file type.
Since these files are older scanned family pictures from the last and previous century I am most interested to know how this could have happened and whether there is a way to revert the file type back so I can use them for inclusion in a family document and processing (in Adobe PS Elements for example)??
Thank you for any helpful suggestion.

Filetypes are assigned via metadata or extender. In the PC and *nix world the extender (.JPG, .DOC, .GIF) indicate what kind of data the file holds and, by extension, what icon the Finder should display for it. Traditionally, the Mac world has depended on metadata, information contained within the file, that not only indicates what kind of file it is, but what program created it. OS X has somewhat muddied the picture for we Mac users. For a time it appeared Apple intended to do away with metadata and depend on extenders. However it now appears that metadata is on the ascendancy again.
I'm not sure what happened to your files but I'm fairly certain of two things: those files didn't have any extender (or an invalid one) and also either had no metadata or it was damaged.

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Message was edited by: station_two

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Message was edited by: Kirby Krieger -- expanded a bit.

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Ryking wrote:
Hi there,
How would you be able to change a track's file type or download from iTunes as a different file type? If possible, I'm aiming for .wma and/or .mp3 types.
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Change of file type

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