# How to identify which Manifest and Cluster Files were used to generate a GTC File
Software like Beeline, GenomeStudio, or BlueFuse Multi may show errors if loading a GTC file with a different Manifest or Cluster File that was used to create the GTC file.
To identify which Product Files were used:
1. Open the GTC file in a text editor, like Notepad++
2. The file is encrypted, but the text including the Manifest and Cluster File names is human-readable.
3. Use Ctrl+F to search “.bpm” to find the text in the file.
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #1484), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000001484%20-%20Microarray%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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