![]() In most cases, you can compress or move the files and put them back when you want to make a change (modify, repair, uninstall). Occasionally however, you may find a program that actively uses some of the files, particularly by setting the icon of their shortcuts (in the Start menu, desktop, etc.) to point to the ARPPRODUCTICON.exe file in its Installer cache. Most programs don’t use the files in the Installer folder at all and they only come into play when you make a change with Add/Remove Programs. Some programs choose to store their entire installer which of course is undesirable, but fortunately those are rare most just store a smaller installer file (like unwise32.exe in the old days) with the basic installation information. for others who find their way here, looking for that. I’ll leave the answer to whether you can compress/archive them as ZIP, RAR, etc. In general, it is used to store/cache the basic installer for programs, so that when you want to modify an installed program, it runs from there and allows you to uninstall or possibly even do a repair without needing the original installation media, and so there should be no adverse affects from setting it to use NTFS compression. The \Windows\Installer folder is the Windows Installer cache, which allows each program to maintain its own installation program, similar to how the WinSxS folder helps to avoid DLL Hell. ![]() ![]() in the \Windows\ directory sometimes shared, sometimes not. In the old days, there were piles of installer files like unwise.exe, unvise32.exe, uninstall.exe, etc. Yes, there is nothing special about the Installer directory that requires them to be uncompressed. ![]()
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