I use slackware 13 and i remove the gtk+ that comes with slackware and installed the GTK+ 2.18.4, but now i cant open files *.svg i tried to uninstall and reinstall the librsvg-2.26.0 but didnt work, i saw here in the forum one tip saying to do this:
gdk-pixbuf-query-loaders > /etc/gtk-2.0/gdk-pixbuf.loaders
i got this msg:
# GdkPixbuf Image Loader Modules file
# Automatically generated file, do not edit
# Created by gdk-pixbuf-query-loaders from gtk+-2.18.4
#
# LoaderDir = /usr/local/lib/gtk-2.0/2.10.0/loaders
#
"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so"
"png" 5 "gtk20" "The PNG image format" "LGPL"
"image/png" ""
"png" ""
"\211PNG\r\n\032\n" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-bmp.so"
"bmp" 5 "gtk20" "The BMP image format" "LGPL"
"image/bmp" "image/x-bmp" "image/x-MS-bmp" ""
"bmp" ""
"BM" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-wbmp.so"
"wbmp" 4 "gtk20" "The WBMP image format" "LGPL"
"image/vnd.wap.wbmp" ""
"wbmp" ""
" " "zz" 1
" `" "z " 1
" @" "z " 1
" " "z " 1

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-gif.so"
"gif" 4 "gtk20" "The GIF image format" "LGPL"
"image/gif" ""
"gif" ""
"GIF8" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-ico.so"
"ico" 5 "gtk20" "The ICO image format" "LGPL"
"image/x-icon" "image/x-ico" "image/x-win-bitmap" ""
"ico" "cur" ""
" \001 " "zz znz" 100
" \002 " "zz znz" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-ani.so"
"ani" 4 "gtk20" "The ANI image format" "LGPL"
"application/x-navi-animation" ""
"ani" ""
"RIFF ACON" " xxxx " 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-jpeg.so"
"jpeg" 5 "gtk20" "The JPEG image format" "LGPL"
"image/jpeg" ""
"jpeg" "jpe" "jpg" ""
"\377\330" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-pnm.so"
"pnm" 4 "gtk20" "The PNM/PBM/PGM/PPM image format family" "LGPL"
"image/x-portable-anymap" "image/x-portable-bitmap" "image/x-portable-graymap" "image/x-portable-pixmap" ""
"pnm" "pbm" "pgm" "ppm" ""
"P1" "" 100
"P2" "" 100
"P3" "" 100
"P4" "" 100
"P5" "" 100
"P6" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-ras.so"
"ras" 4 "gtk20" "The Sun raster image format" "LGPL"
"image/x-cmu-raster" "image/x-sun-raster" ""
"ras" ""
"Y\246j\225" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-tiff.so"
"tiff" 1 "gtk20" "The TIFF image format" "LGPL"
"image/tiff" ""
"tiff" "tif" ""
"MM *" " z " 100
"II* " " z" 100
"II* \020 CR\002 " " z zzz z" 0

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so"
"xpm" 4 "gtk20" "The XPM image format" "LGPL"
"image/x-xpixmap" ""
"xpm" ""
"/* XPM */" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xbm.so"
"xbm" 4 "gtk20" "The XBM image format" "LGPL"
"image/x-xbitmap" ""
"xbm" ""
"#define " "" 100
"/*" "" 50

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-tga.so"
"tga" 4 "gtk20" "The Targa image format" "LGPL"
"image/x-tga" ""
"tga" "targa" ""
" \001\001" "x " 100
" \001\t" "x " 100
" \002" "xz " 99
" \003" "xz " 100
" \n" "xz " 100
" \013" "xz " 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-icns.so"
"icns" 4 "gtk20" "The ICNS image format" "GPL"
"image/x-icns" ""
"icns" ""
"icns" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-pcx.so"
"pcx" 4 "gtk20" "The PCX image format" "LGPL"
"image/x-pcx" ""
"pcx" ""
"\n \001" "" 100
"\n\002\001" "" 100
"\n\003\001" "" 100
"\n\004\001" "" 100
"\n\005\001" "" 100

"/usr/local/lib/gtk-2.0/2.10.0/loaders/svg_loader.so"
"svg" 2 "gtk20" "Scalable Vector Graphics" "LGPL"
"image/svg+xml" "image/svg" "image/svg-xml" "image/vnd.adobe.svg+xml" "text/xml-svg" "image/svg+xml-compressed" ""
"svg" "svgz" "svg.gz" ""
" <svg" "* " 100
" <!DOCTYPE svg" "* " 100

bash-3.1$

If you're going to upgrade gtk, you need to build it using prefix=/usr and make a package so that you can upgrade it cleanly. I'm running gtk-2.18.3 here, so I'm quite certain that everything still works if you do it correctly.

Just out of curiosity, which features of the newer GTK do you find appealing?

None really - I just needed it for testing something else.

thanks a lot, its works now