Quotes (") are needed around %1 and %s in php_iis_reg.inf in order to give php3 proper long file name support (i.e. spaces in file names).

A fixed file is below, presuming chars didn't get scrambed ia characterset conversion.  Email me for a safe version if you want.

; Application: PHP
; Version    : 3.0.2
; Copyright  : ? 1998 by PHP Development Group
; Created by : INF-Tool Setup Program and INF File Generator
;              Version 3.74/r (8/15/98) from www.user.xpoint.at/r.fellner/
; changes S Liddicott 1999 to add " around %1 and %s for registry values
; ---------------------------------------------------------------------------

[Version]
Signature=$Chicago$
Provider=%Author%
SetupClass=BASE
Class=NoDriver

[Optional Components]
INFTool_1

[Optional Components.ntx86]
INFTool_1.ntx86

[Strings]
Product="PHP"
Version="3.0.2"
Info="PHP 3.0.3 for Windows"
Author=""
Copyright="? 1998 by PHP Development Group"
DiskName="PHP, Setup Disk #1"
Setup="SOFTWARE\Microsoft\Windows\CurrentVersion\Setup"

[INFTool.RegFix]
HKCR,lnkfile,IsShortcut
HKCR,piffile,IsShortcut

[INFTool.Add.Reg.95]
HKLM,"System\CurrentControlSet\Services\W3Svc\Parameters\Script Map",".php3",0,"c:\php3\php.exe ""%s"" ""%s"""
HKLM,"System\CurrentControlSet\Services\W3Svc\Parameters\Script Map",".phtm3",0,"c:\php3\php.exe ""%s"" ""%s"""
HKLM,"System\CurrentControlSet\Services\W3Svc\Parameters\Script Map",".php",0,"c:\php3\php.exe ""%s"" ""%s"""
HKCR,".php3","",0,"phpfile"
HKCR,".phtm3","",0,"phpfile"
HKCR,".php","",0,"phpfile"
HKCR,"phpfile","",0,"PHP Script"
HKCR,"phpfile","EditFlags",1,00,00,01,00
HKCR,"phpfile\Shell\open","EditFlags",1,01,00,00,00
HKCR,"phpfile\Shell\open\command","",0,"c:\php3\php.exe ""%1"""

[INFTool.Add.Reg.ntx86]
HKLM,"System\CurrentControlSet\Services\W3Svc\Parameters\Script Map",".php3",0,"c:\php3\php.exe ""%s"" ""%s"""
HKLM,"System\CurrentControlSet\Services\W3Svc\Parameters\Script Map",".phtm3",0,"c:\php3\php.exe ""%s"" ""%s"""
HKLM,"System\CurrentControlSet\Services\W3Svc\Parameters\Script Map",".php",0,"c:\php3\php.exe ""%s"" ""%s"""
HKCR,".php3","",0,"phpfile"
HKCR,".phtm3","",0,"phpfile"
HKCR,".php","",0,"phpfile"
HKCR,"phpfile","",0,"PHP Script"
HKCR,"phpfile","EditFlags",1,00,00,01,00
HKCR,"phpfile\Shell\open","EditFlags",1,01,00,00,00
HKCR,"phpfile\Shell\open\command","",0,"c:\php3\php.exe ""%1"""
[INFTool.AddINI]
win.ini,Desktop,Wallpaper,HKLM,%Setup%,2
win.ini,Desktop,TileWallpaper,HKLM,%Setup%,2

[SourceDisksNames]
1=%DiskName%,,0

[SourceDisksFiles]

[DestGrp]

[DestLGrp]

[DestinationDirs]
DestGrp=25,
DestLGrp=25,

[DefaultInstall]
Ini2Reg=INFTool.AddINI
AddReg=INFTool.Add.Reg.95,INFTool.RegFix
Copyfiles=DestGrp

[DefaultInstall.ntx86]
AddReg=INFTool.Add.Reg.ntx86
Copyfiles=DestGrp

[INFTool_1]
OptionDesc=%Product%
Tip=%info%
InstallType=0
IconIndex=11
AddReg=INFTool.Add.Reg.95,INFTool.RegFix
Copyfiles=DestGrp

[INFTool_1.ntx86]
OptionDesc=%Product%
Tip=%info%
InstallType=0
IconIndex=11
AddReg=INFTool.Add.Reg.ntx86
Copyfiles=DestGrp

[IniUpdate]
Win.ini,Desktop,"WallpaperOriginX=*"
Win.ini,Desktop,"WallpaperOriginY=*"