| Цитата(MSDN) | Windows 95 OSR2 and later: The GetDiskFreeSpaceEx function is available beginning with Windows 95 OEM Service Release 2 (OSR2), and you should use it whenever possible. The GetDiskFreeSpaceEx function returns correct values for all volumes, including those that are larger than 2 GB.
Windows Me/98/95: For volumes that are larger than 2 GB, the GetDiskFreeSpace function may return misleading values. The function caps the values stored into *lpNumberOfFreeClusters and *lpTotalNumberOfClusters so as to never report volume sizes that are greater than 2 GB. On volumes that are smaller than 2 GB with an actual sectors per cluster greater than 64, *lpSectorsPerCluster will be capped at 64 and the values stored into *lpSectorsPerCluster, *lpNumberOfFreeClusters, and *lpTotalNumberOfClusters will be incorrect. That is because the operating system adjusts the values so that computations with them yield the correct volume size with the capped *lpSectorsPerCluster.
Windows Me/98/95: GetDiskFreeSpaceW is supported by the Microsoft Layer for Unicode. To use this, you must add certain files to your application, as outlined in Microsoft Layer for Unicode on Windows 95/98/Me Systems.
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Судя по этому куску - может, правда изначаль (в самих переменных) будут некоректные данные  |