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Appears to be based on the sample drive from MS DDK documentation. It seems you can get MS to send you the DDK for free, but the shipping is $15.
I have to investigate it further, however it seems that this is not, what I need. The RAMDrive driver just provides storage to Windows, which uses it to store FAT filesystem. So it is too low-level. What I have to do is to emulate the actual filesystem. In other words, RAMdrive read/writes bytes, while I need to read/write files.