=> R0 = 3 (Write file extent)
R1 = internal file handle returned by FSEntry_Open
R2 = new file extent
This call is made when FileSwitch needs to extend a file beyond its current length. For buffered files this is only called when the file is closed. On unbuffered files this is called whenever the user requests it.
On systems with no concept of extents (eg streams) this should not return an error.
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