This used to work, too, now doesn't. Causes an error on the execution of the installer:
Section "MainGroup" SEC01
SetOverwrite on
File /oname=$INSTDIR\paintschemes\skins\Bf-110G-2\7JG77DH1Bf110G2.bmp ..\..\temp\work\7JG77DH1Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\netchace\-2366628351366167869.bmp ..\..\temp\work\7JG77DH1Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\Bf-110G-2\7JG77DH2Bf110G2.bmp ..\..\temp\work\7JG77DH2Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\netchace\-6082696020110566282.bmp ..\..\temp\work\7JG77DH2Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\Bf-110G-2\7JG77SH2Bf110G2.bmp ..\..\temp\work\7JG77SH2Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\netchace\-3457948107375055752.bmp ..\..\temp\work\7JG77SH2Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\Bf-110G-2\7JG77SH3Bf110C4.bmp ..\..\temp\work\7JG77SH3Bf110C4.bmp
File /oname=$INSTDIR\paintschemes\skins\netchace\2855022606088577029.bmp ..\..\temp\work\7JG77SH3Bf110C4.bmp
File /oname=$INSTDIR\paintschemes\skins\Bf-110G-2\7JG77SM1Bf110G2.bmp ..\..\temp\work\7JG77SM1Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\netchace\-4371902144251491401.bmp ..\..\temp\work\7JG77SM1Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\Bf-110G-2\7JG77SM2Bf110G2.bmp ..\..\temp\work\7JG77SM2Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\netchace\-8310214408202334682.bmp ..\..\temp\work\7JG77SM2Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\Bf-110G-2\7JG77SN1Bf110G2.bmp ..\..\temp\work\7JG77SN1Bf110G2.bmp
File /oname=$INSTDIR\paintschemes\skins\netchace\2184738425766834999.bmp ..\..\temp\work\7JG77SN1Bf110G2.bmp
SectionEnd