Can't un-write protect TDM files

I am using the storage VIs to manipulate a TDM file that was created using the TDM header writer API. When I try to do any operations on it (specifically, deleting a channel), i get error -2561 "Data storage is write-protected.". I have checked the permissions on the file and they should be correct.
I ran some tests and found that i can create a TDM file using the storage VIs and delete a channel without any issues. According to LabVIEW, the file created using this method has the same permissions of the problem file.
Do you think this could be a bug with the TDM header writer VIs? Or am i missing something obvious?
I have attached files showcasing the issue.
Thanks in advance for any help.
Attachments:
TDM test.zip ‏131 KB

Bazookazuz-
The standard is described in the Developer Zone described above. TDM files are binary files written such that it follows a particular pattern. That way the data can be easily retrieved and interpreted later. It is written in the fashion to save disk space and to be created/modified quickly. All TDM files acquiring data from multiple channels follow the same format alternating between each channel taking each sample (also described in the Developer Zone article). By converting the data to End-to-End, it makes all the data for each channel together.
In order to distinguish between the modified and unmodified tdm files, there is no way to just look at the file type and know without a naming scheme. Programmatically, you can parse out the first few data sets and see if they are the same channel and then you can determine from there.
Regards,
Mike S
NI AE

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