If you really want to know exactly what the OTC file is, you can open it with a zip-file tool like 7zip. The only difference between the IPC and the mPad OTC file is the OpconSystemStartup.bat. This file is individual for each target system and will not be overwritten at other target systems when you apply the OTC file. So, you can always confirm that files should be overwritten. (There are some rare projects where the Deploy.bat directly in Station\Targets has been modified. So, if you want to make a back-up of this file, you are on the safe side.)
There is no way to find out what OTC file version is present in the project. The version number does not appear at any of the components that are unpacked when applying the OTC file.
OTC files usually have the version number of the Control plus version, so 1.10 would match OES 4.10, but the file did not need any changes when OES 4.11 was released, so 1.10b is still the latest version.
I asked about RSA because encryption/decryption errors were often related to RSA in the past. Also, when working out of a VM, encryption could make problems depending on the network adapter settings.
Even if the mPad is at the customer: Do you remember if it is Win 7 or Win 10?
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