from https://www.betaarchive.com/forum/viewtopic.php?t=26026 en_7601.17S14.101119-1850_x64fre_enterprisen_en-us_VL_UPG_OEM_EnterpriseN-GRMCNENXVCCP_EN_DVD.iso en Language of the OS. Always two letters (with one exception). Example: en, en-gb, cs, da, no, sv. 7601.17514 Minor version build of the OS. 101119-1850 Compile date of the OS (not of the ISO). Indicates YYMMDD-HHMM. x64fre Platform architechture and target. x86 = 32bit 8086-based x64 = 32bit 8086-based with 64bit AMD-64 extensions fre = Free, for end user chk = Checked, debug version Examples: x86fre, x64chk. enterprisen SKU version. Examples: enterprise, enterprisen, professional, starter. (The "N" flag indicates the version does not force install of Windows Media Player, per European court ruling.) en-us Full language tag of the OS. Must match (1). Examples: en-us, en-gb, sv-se. VL Volume license identifier. Optional. UPG Upgrade identifier. Optional. OEM Original equipment manufacturer identifier. Optional. EnterpriseN Matches (5). GRMCNENXVCCP_EN_DVD Volume label of the mounted ISO volume. Contains various codes to identify language, SKU, volume/OEM and media. en_windows_7_enterprise_with_sp1_x86_dvd_u_677710.iso en Language of the OS. Always two letters (with one exception). Example: en, en-gb, cs, da, no, sv. windows_7 Product name. Examples: windows_7, windows_8, windows_server_2012. enterprise SKU version. Examples: enterprise, enterprisen, professional, starter. with_sp1 Integrated service pack level. Optional. x86 Platform architechture and target. x86 = 32bit 8086-based x64 = 32bit 8086-based with 64bit AMD-64 extensions chk = Checked, debug version Examples: x86, x64chk. dvd Storage media u Update flag. The ISO was updated with some critical patch. 677710 Unique MSDN/Technet image number ID. en_SW_DVD5_Win_Pro_N_7w_SP1_32BIT_English_-2_MLF_X17-59635.iso en Language of the OS. Always two letters. Example: en, cs, da, no, sv. SW ? DVD5 Single or double layer DVD. DVD5 = 4.7GB Win Product name. Win = Windows. Pro_N SKU version. Examples: Pro, Pro KN, Ent. 7w 7 With. Means it's an integrated installation with a service pack. Combined with next for full service pack level information. Optional. SP1 Integrated service pack level. Optional. 32BIT Platform target. 32BIT = x86, 64BIT = x64. English Language of the OS. -2 ? MLF Microsoft Licensing Fulfillment X17-59635 Microsoft Part Number as it appears on the physical installation media.