HFS file system with addtional software windows can read it
The default file system is HFS+ and cannot be read by Windows computers without the aid of third-party software.
File Systems supported by Mac OS X:Local File Systems HFSHFS+ISO9660MSDOSNTFSUDFUFSNetwork File Systems AFPFTPNFSSMB/CIFSWebDAVOther deadfsdevfsfdescfifofsloopnullfsramfsspecfssynthfsunionvolfs
Mac OS X cannot read an NTFS file system without the assistance of a third party program. See the related link below for a list of solutions if it is absolutely necessary to open NTFS file systems using OS X.
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If you have installed Windows using Bootcamp you will be able to see Mac OS X disk and access all files, but this disk will be always read only. Same situation is with Linux operating system.
If you are referring to the operating system then a Mac's default operating system is called Mac OS X. A Mac can be downgraded to run most versions of the Windows operating system from XP to 7.
If you mean mac of computers than its Apple
The question mark's appearance on a Mac file indicates that the Mac is unable to locate the System software that it needs to open that file.
Mac OS Extended Journaled
There are numerous options for a computer running Windows to read a Mac's HFS+ files system. Apple's Boot Camp includes HFS+ drivers for Windows. There are commercial products such as MacDrive or free alternatives like HFSExplorer. (See links below)
While the default file system used on a Macintosh doesn't require defragmenting, you can do so with a thrid party utility called iDefrag. However, some argue that defragmenting a Mac actually hurts performance due to the nature of the file system's indexing.
A Microsoft Installer file (.msi) will only work with Microsofts Windows operating system it will not work with Mac OS X. You can open the file to read it by right clicking on its icon and selecting Open with... from the menu and then selecting a text editor.