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copied!<p>Never mind. I have written a custom task to do the job:</p> <pre><code> public class ReplaceExtension : Task { [Required] public string FilePath { get; set; } public string NewExtension { get; set; } [Output] public string Result { get; set; } public override bool Execute() { if (string.IsNullOrEmpty(FilePath)) { Log.LogError("FilePath cannot be empty!"); return false; } try { int length = FilePath.Length; int startIndex = length; int oldExtensionLength = 0; while (--startIndex >= 0) { char ch = FilePath[startIndex]; if (ch == '.') { oldExtensionLength = length - startIndex; break; } if (ch == Path.DirectorySeparatorChar || ch == Path.AltDirectorySeparatorChar || ch == Path.VolumeSeparatorChar) { break; } } bool isNewExtensionEmpty = string.IsNullOrEmpty(NewExtension) || (NewExtension.Length == 1 && NewExtension[0] == '.'); if (isNewExtensionEmpty) { // The new extension is empty - remove the old extension. if (oldExtensionLength > 0) { Result = FilePath.Remove(startIndex, oldExtensionLength); } else { Result = FilePath; } } else { // Replace the old extension with the new one. StringBuilder sb = new StringBuilder(FilePath.Length - oldExtensionLength + NewExtension.Length + (NewExtension[0] == '.' ? 0 : 1)); sb.Append(FilePath, 0, FilePath.Length - oldExtensionLength); if (NewExtension[0] != '.') { sb.Append('.'); } sb.Append(NewExtension); Result = sb.ToString(); } } catch (Exception ex) { Log.LogErrorFromException(ex); } return !Log.HasLoggedErrors; } } </code></pre> <p>I am using it like this:</p> <pre><code> <Target Name="CreateProperties"> <ReplaceExtension FilePath="$(TestResultsFilePath)" NewExtension="xml"> <Output TaskParameter="Result" PropertyName="NUnitResultsFilePath"/> </ReplaceExtension> </Target> </code></pre>

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