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The other problem is that the cache is not cleared until you unmount the drive. I can understand saving individual files to a cache, but even then it should ideally be done in memory if the files being accessed are small enough.

Having to extract the whole archive is perfectly normal if it's solid, but extracting to disk keeps you from accessing archives bigger than your free space. First, if the archive is solid then the program has to extract the entire contents to disk. The way WinArchiver Virtual Drive handles its cache seems flawed. After replacing the DLL from 2010, Win Archiver was able to mount and read archives compressed with LZMA2. Not wanting to replace my 64-bit copy of 7-Zip, I was able to open the installer EXE in 7-Zip and get the 32-bit DLL I needed. I had removed WinArchiver Virtual Drive so I reinstalled it and then went to the 7-Zip website and downloaded a 32-bit copy of 7-Zip. Several weeks later, it occurred to me that I had tried to use a 64-bit DLL when the program and the original DLL were 32-bit. I tried replacing it with a newer copy from my 7-Zip installation, but that produced an error.

I looked in the installation folder and saw a file called 7z.dll, dated March 24, 2010. I tried again with LZMA and it worked, but I didn't want to have to start using LZMA because it doesn't seem to compress as well. The archive I had tried was compressed with LZMA2. The problem was, when I tried to open a file, I saw a notice in the taskbar about an unsupported method, meaning compression method. I navigated to the virtual drive and saw the contents of the archive.

I tried it out and it was able to mount one of my archives as a CD drive. I found a free program called WinArchiver Virtual Drive. At first I wanted a method where I could read and write to the virtual drives, but that proved to be too much so I settled for a read-only solution. I've been looking for a way to mount 7-Zip archives as virtual drives, similar to how IMDisk works with uncompressed disk images.