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dj 8adam-e!, your screenshot shows not all of the involved actions, and sadly to say, I am not very experienced in reading greek language. When ever possible for you, please try to communicate in english language and offer Mp3tag screenshot in english skin too.
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The partly shown list of actions have simple "Replace" actions.
The first action is a modified "Replace (only as whole word)".
Did you ever check the result of this action?
I think this action will do nothing.
Assumingly there is a file in the filesystem having this filename "This is my filename.MΠ3", then Mp3tag will not respect this file, because of the bad file extension. Although the file data might be internally of type MP3, other player applications might not accept such a filename, Mp3tag simply does not show such a badly named file in it's file list view.
Therefore this first action is needless.
The replace modifier "only as whole word" is needless too, because a "whole word" is defined as a sequence of non space letters which are delimited by at least one space character or the word is the first or last word in a line of words.
Having a string of ".MΠ3" this looks not to be a "whole word".
Same in the string "This is my filename.MΠ3" the substring ".MΠ3" will not be a "whole word".
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And even better, looking at the complete filebasename (filerootname.fileextension) the dot character seems to be handled in different ways by Mp3tag.
Having the filename "This.is my filename.mp3" the "Replace" action can replace "is.is" with "is is", but not "e.mp3" with "e.mp4".
Nevertheless "Replace" action is able to replace "mp3" with "mp4", giving the filename "This.is my filename.mp4"
Having the filename "This.is.my.filename.mp3" the "Replace" action can replace "." with "" (i. e. nothing, that means remove all dots), which results into the filebasename "Thisismyfilename.mp3".
You see that Mp3tag has saved the fileextension.
Mp3tag respects the dot in different ways. The right most dot is treated as the delimiter between the filerootname and the fileextension. All other dots at the left side of this one name delimiter dot are treated as simple characters of the filerootname (and can be object of the replace action).
The bad side effect of the "Replace" action when working on the pseudo tag-field "_FILENAME" is the case as mentioned above, that the given file extension can be changed accidentally.
Having a filename "jump3money.mp3" which should be named to "jump4money.mp3" will be
changed to "jump4money.mp4" when using "Replace" action and replace "mp3" with "mp4".
I tend to mark this as a bug of the "Replace" action when working on pseudo tag-field "_FILENAME".
At least there is a trap for the user to accidentally change the fileextension to make the file unusable. This behaviour should be revised.
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The third action from your list of "Replace" actions is needless (from ".mp3" to ".mp3").
All other shown actions from the screenshot are looking fine.
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Conclusion.
Such a filename "This is my filename.MΠ3" needs to be renamed from outside of Mp3tag by a specific file renamer tool (e. g. command REN on the commandline, Windows Explorer, Total Commander or other tools).
Try the attached cmd file, it might be possible, that it can rename the "*.MΠ3" files - no guarantee at all. First remove the ".txt" extension. Copy the cmd file into the root folder of the foldertree which contains the *.MΠ3 files and run it.
Rename_M__3_to_mp3.cmd.txt (241 Bytes)
DD.20100917.1334.CEST
Rename_M__3_to_mp3.cmd.txt (241 Bytes)