bulk rename tracks with extensions

Generally speaking you shouldn't use keyboard presses in your scripts/macros. Instead, you should use UI and menu click commands whenever possible. This makes them more bullet proof.
This should do it:
( if you're running PT 20.12 then this script will take advantage of the new PT SDK to rename the tracks - it's much faster and concise).

function getProToolsVersion() {
    let proToolsVersion = sf.ui.proTools.appVersion;
    let splitVersion = proToolsVersion.split('.');
    let versionYear = splitVersion[0];
    let versionMonthString = splitVersion[1];
    let correctedVersionMonth = versionMonthString[0] != '1' ? "0" + versionMonthString.slice(-2) : versionMonthString;
    let proToolsVersionString = versionYear + '.' + correctedVersionMonth;
    let proToolsVersionAsNumber = Number(proToolsVersionString);
    return proToolsVersionAsNumber;
}

// Switch to PT and clear cache
sf.ui.proTools.appActivateMainWindow();
sf.ui.proTools.mainWindow.invalidate();

//Check if PT version is SDK Compatible
const isPTSDKCompatible = (getProToolsVersion() >= 21.12);

// Get selected Tracks
const selectedTracks = sf.ui.proTools.selectedTrackNames;

//Scroll to first selected track and reselect selectedTracks
sf.ui.proTools.trackSelectByName({ names: [selectedTracks[0]] });
sf.ui.proTools.selectedTrack.trackScrollToView();
sf.ui.proTools.trackSelectByName({ names: selectedTracks });

// Create new playlist for all selected tracks
const playlistSelector = sf.ui.proTools.selectedTrack.popupButtons.whoseTitle.is("Playlist selector").first;

playlistSelector.popupMenuSelect({
    menuPath: ["New..."],
    isShift: true,
    isOption: true
});

// If only one track is selected, wait for confirmation dialog and click ok
if (selectedTracks.length == 1){
    const confirmationDlg = sf.ui.proTools.confirmationDialog;
    confirmationDlg.elementWaitFor();
    confirmationDlg.buttons.whoseTitle.is("OK").first.elementClick();
}

// If PT  version is not SDK compatible use this routine to bulk rename tracks. Else use new PT SDK
if (!isPTSDKCompatible) {
    // Open Batch rename window
    sf.ui.proTools.selectedTrack.titleButton.popupMenuSelect({
        isRightClick: true,
        menuPath: ["Batch Rename..."],
    });

    // Make reference to Batch Rename window
    const batchRenameWindow = sf.ui.proTools.windows.whoseTitle.is("Batch Track Rename").first;

    // Wait for batch rename window to open
    batchRenameWindow.elementWaitFor();

    // Disable all checkboxes
    const batchCheckBoxes = batchRenameWindow.checkBoxes.map(cb => cb.checkboxSet({
        targetValue: "Disable"
    }));

    // Define checkboxes to set
    const batchCheckBoxesToSet = {
        "Replace": "Enable",
        "Clear Existing Name": "Disable",
        "Regular Expressions": "Enable"
    }

    //Set checkboxes 
    for (let key in batchCheckBoxesToSet) {
        batchRenameWindow.checkBoxes.whoseTitle.is(key).first.checkboxSet({ targetValue: batchCheckBoxesToSet[key] })
    };

    //Set Regular Expression to define text to be replaced (everything from the last "." onward)
    batchRenameWindow.textFields.first.elementSetTextFieldWithAreaValue({
        value: "\.[^.]+$",
    });

    // Set replacement text
    batchRenameWindow.textFields.allItems[1].elementSetTextFieldWithAreaValue({
        value: ".edit",
    });

    // click "OK" close batch rename window to batch rename selected tracks
    batchRenameWindow.buttons.whoseTitle.is("OK").first.elementClick();

    //Wait for batch rename window to close
    batchRenameWindow.elementWaitFor({ waitForNoElement: true });

} else {
    // We're using  21.12 or later - use new SDK commands to rename tracks
    //   Get new track / playlist names
    const newPlaylistNames = sf.ui.proTools.selectedTrackNames;

    //Rename tracks
    newPlaylistNames.forEach(track => {
        sf.app.proTools.renameTrack({
            oldName: track,
            newName: track.replace(/\.[^.]+$/, ".edit"),
            onError: "Continue"
        })
    });
}

Hi Chris,
I obviously must be doing something wrong. I copy and pasted what you wrote and put it in as a new script.

It starts a new playlist of all highlighted tracks and then it says TypeError " Cannot read property of "renametrack" "undefined

I run Pro Tools Ultimate 2022.4.0

I tried modifying your code...it doesn't do anything then.
Keep in mind, I have -100 code skills,..

Your help is greatly appreciated.

Thanks,
Andy