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'''SEL''' files are helper tables that accompany RSO files. They link function calls from a module to the main executable (main.dol). ''Super Mario Galaxy'' and ''Super Mario Galaxy 2'' each contain only one SEL file, located in <code>ModuleData/product.sel</code>.

== File specifications ==
=== Header ===
{| class="wikitable"
|-
! Offset
! Type
! Description
|-
| 0x00
| Byte[8]
| Unknown
|-
| 0x08
| UInt32?
| Unknown. 0x16 in SMG, 0x17 in SMG2
|-
| 0x0C
| UInt32
| Length of header
|-
| 0x10
| UInt32
| Offset to [[SEL (File Format)#Executable filename|executable filename]]. Likely disregarded by the code
|-
| 0x14
| UInt32
| Length of the executable filename string. Apparently not null terminated?
|-
| 0x18
| UInt32
| Unknown. 0x1 in SMG and SMG2
|-
| 0x1C
| Byte[20]
| Unknown. Likely padding
|-
| 0x30
| UInt32
| Offset to [[SEL (File Format)#Function name list|function name list]]
|-
| 0x34
| Byte[4]
| Unknown. 0x0 in SMG and SMG2
|-
| 0x38
| UInt32
| Offset to function name list (again?)
|-
| 0x3C
| Byte[4]
| Unknown. 0x0 in SMG and SMG2
|-
| 0x40
| UInt32
| Offset to [[SEL (File Format)#Linker table|linker table]]
|-
| 0x44
| UInt32
| Length of linker table
|-
| 0x48
| UInt32
| Offset to function name list (again?)
|-
| 0x4C
| UInt32
| Offset to function name list (again?)
|-
| 0x50
| Byte[4]
| Unknown. 0x0 in SMG and SMG2
|-
| 0x54
| UInt32
| Filesize, padded to the nearest 0x4 but excludes the rest of the file's padding
|}

=== Executable filename ===
This is a single-entry-table containing the name of the executable that this .sel file links to. <code>product.sel</code> in SMG and SMG2.

=== Linker table ===
This table links function names used by the .rso to the main executable (main.dol).
{| class="wikitable"
|-
! Offset
! Type
! Description
|-
| 0x0
| UInt32
| Offset to the function name within the .sel file
|-
| 0x4
| UInt32
| Address within the specified section. For 0x1 and 0x2: relative to the section start*. For 0xFFF1: absolute address
|-
| 0x8
| UInt32
| Section within the executable (main.dol)
|-
| 0xC
| UInt32
| Hash of the function name
|}

<nowiki>*</nowiki> The section start can be determined by looking at the main.dol executable. Section 1 address is found at offset 0x48, section 2 address is found at offset 0x4C.

=== Function name list ===
This is a pool of null-terminated strings holding various function names. According to the header this pool is padded to the nearest 0x4.<br>
<br>
The rest of the file is padded to the nearest 0x20.

SEL (File Format) - Revision history

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